Also, is the fact that I went to additional confessors and didn't obey the directives given by my regular Confessor considered a sin in and of itself? 

In the "Ten Commandments for the Scrupulous" PDF file, it doesn't seem to give a concrete answer as it implies one thing but then says another:

"#7. You shall obey your confessor when he tells you never to repeat a general confession of sins already confessed to him or another confessor.

... The entire scenario is made more complicated by the second component of this commandment: when penitents try to get around the rule by seeing additional confessors. It’s at least less than honest to seek out another confessor to engage in the repetitive behavior. It might even be a form of deceitful enterprise.

... The consistent directive of the great saints throughout the ages ... has been to follow God’s spiritual counsel in all things. When you choose a path that isn’t supported by his strong and guiding hand, you take a step backward in your own spiritual growth and development.

It’s most certainly not a sin to choose not to follow his directives, but it’s counterproductive and not at all helpful."

So was my last general confession even valid? The priest did absolved me and just told me to until my regular confessor this Sunday that I made a general confession last Sunday. I feel like I'm not really getting any answers when I asked anyone or that no one seems to really know.

Also, is the fact that I went to additional confessors and didn't obey the directives given by my regular Confessor considered a sin in and of itself?

In the "Ten Commandments for the Scrupulous" PDF file, it doesn't seem to give a concrete answer as it implies one thing but then says another:

"#7. You shall obey your confessor when he tells you never to repeat a general confession of sins already confessed to him or another confessor.

... The entire scenario is made more complicated by the second component of this commandment: when penitents try to get around the rule by seeing additional confessors. It’s at least less than honest to seek out another confessor to engage in the repetitive behavior. It might even be a form of deceitful enterprise.

... The consistent directive of the great saints throughout the ages ... has been to follow God’s spiritual counsel in all things. When you choose a path that isn’t supported by his strong and guiding hand, you take a step backward in your own spiritual growth and development.

It’s most certainly not a sin to choose not to follow his directives, but it’s counterproductive and not at all helpful."

So was my last general confession even valid? The priest did absolved me and just told me to until my regular confessor this Sunday that I made a general confession last Sunday. I feel like I'm not really getting any answers when I asked anyone or that no one seems to really know.

Take a deep breath, relax. (I'm serious). God wants your salvation more than you do. It helps me to relax if I try to remember that I am really confessing to Jesus. I often pray "Lord help me to make a good confession, speak through Thy Priest help me to hear, love, and obey Thee."  
I'm not sure why, but for some reason, St. Gabriel Possenti helps me greatly if I pray to him before confession. You might try praying to him or some other Saint that you are drawn to.

Just tell the Priest that you are really struggling with scruples, have made multiple general confessions even when directed not to (that's enough detail, the Priest will ask you questions if he needs more info).

Trust the Lord. If you pray what is recommended above, you'll be amazed (in a good way) at what you'll hear.
Will pray for you, please remember me at Mass.

That's what causes scruples, trusting yourself. We have to take a leap of Faith and actually trust God. And we also must learn that it is His work in us that really matters. You must let go and trust.

Thanks for your response. I haven't talked to anyone about this yet so this means a lot. It would seem as though if I don't make a valid confession that's on me, not God, right? It all boils down to this: If I don't have a reliable mind I can't ever make a valid confession. That's not to say I am despairing. Maybe I'm not getting what you are saying.

I'm not clear on what you mean by a reliable mind. Are you concerned that you're forgetting sins? Or are you having trouble identifying what may have been a sin?

The former. At some times I think I'll remember a sin, forget to write it down and remember it later. This is only one formulation or species of this, but the point is... I am concerned that I am intentionally pushing sins out of my mind. Whether that confession is invalidated or not by this is not necessarily the problem at hand even. I try to write down all sins on paper and keep this for later but I'm not always in a position in which I can just whip out the notepad. I also think I potentially conceal sins from myself. Even doing a nightly examination of conscious I doubt I am doing this well enough. Ever since I converted and was made aware of the concept of mortal sin etc about a year and a half ago I am just in constant torture and I have to avoid confirmation and the Eucharist until I am clear. I know my priest will probably tell me something like the original poster so I intentionally avoid conversations with the priest or anyone else just so people figure I'm the quiet type that just takes my family to Mass and goes home.
Thanks so much again for responding. You have no clue how much you are helping me. Thank God for getting me on this forum so I could have this conversation.

I'm going to talk to you like I talk to one of my children.  It seems to me that you never had a good formation for Confession as a child, and now you're dealing with this as an adult.  

There are 5 things needed to make a good confession.

1.  Know your sins
2.  Be sorry for your sins.
3.  Make up your mind not to sin again
4.  Tell your sins to the priest
5.  Do the Penance the priest gives you.

That's it.  Make a good examination of conscience.  NOT over and over.  ONE good honest one.  

Then, ask for the graces to have a true sorrow for your sins.  This does NOT mean tears coursing down your cheeks every Confession!  The simple desire to have true sorrow--sorry because we've offended God--I repeat, the desire is enough.

Have a firm purpose of amendment.  Not an "Oh, well, I'll just confess it so I can go to Holy Communion, but after confession I'll go ahead and keep stealing those candy bars (or whatever)!"

Tell your sins--Now.  If you forget any...absolutely any...they are forgiven.  The important thing is to confess ALL mortal sins.  I think this is where you're getting hung up.  If you have honestly forgotten one in confession, it's still forgiven.  If you remember it later, it's ok to still go to Holy Communion--it's been forgiven, but you HAVE to confess that you forgot one at your next Confession.  But you didn't just make a bad confession!  If you have the honest will to confess all mortal sins, then Our Lord sees that.  He knows your true intent was to confess.  Since you're worried that you're pushing them out of your head, then you probably are NOT.  

And of course, do your penance.

If you fulfill all those, you've just made a good Confession.  

I think that your problem is you tend to over think things.  Remember, in order to be a mortal sin, it has to fulfill 3 conditions.  1.  Serious matter   2.  Full consent
3.  Done willingly (deliberate consent)

Serious matter--killing a man vs punching someone?  Extorting thousands of dollars vs pennies of interest on a savings account?  

You see? 

My main advice to you would be to try to be more child-like.  Children are so simple and innocent; you've got to stop this!  Of course the devil doesn't want you to go to Holy Communion and tries to trick you into thinking you've made a bad confession.

As someone else said, you must TRUST.  Pray for that grace!

I would highly reccommend the book written by Mother Mary Loyola.  It's titled "My First Confession" and is written for 8-10 year olds.  It explains the purpose of Confession and tells you how to make a good one.  It's excellent; I enjoy reading it every time I teach my children!  Very quick read; you might want to look into it.  

Good luck!  My prayers are with you.  And go to Holy Communion today!  If you're afraid you've made an unworthy confession, you probably just made a good one.  That devil is very very sneaky.

If you remember it later, it's ok to still go to Holy Communion--it's been forgiven, but you HAVE to confess that you forgot one at your next Confession.  

Thank you for your post, it was very helpful. Thanks to everyone else as well. It is very much appreciated. 

However, I have a question in relation to the above. I understand that if you accidentally forgot something in confession, then you should confess it the next time but, my concern is with remembering past mortal sins, whether relatively recently (say a few months ago) or in the distant past. These are mortal sins and I feel compelled to confess them but, my confessor tells me not to confess anything from the past. This is what really is upsetting my scruples. I feel like since, when I try to confess anything from the past and the priest basically shuts me down and says "nothing from the past!" I'm therefore omitting mortal sins (albeit not intentionally; in fact, I strongly desire to confess them). I just want to confess everything I can remember so as to complete the process of reconciliation with God.

I feel like because I'm unable to confess them, they are still with me and I'm not fully absolved or, perhaps, out of trying to be obedient to the confessor and not trying hard enough to explain the situational context, I'm therefore making a sacrilege or something along those lines. 

I literally just remembered something now that has me extremely concerned. 

Don't worry about this thing. Being confused or mistaken about your penance would not invalidate your confession. Just pray a whole 15 decade rosary as soon as you can and mention the confusion about the penance to your priest if it still bothers you.