The Catholic doomsday checklist has one item:
( ) State of grace?
When you've got that covered, it doesn't matter if it's a comet, a war, a natural disaster, or just plain old age... you're already ready for it all. And you can be at peace, like how God wants us to be.
Remember, God has the very hairs of our heads numbered... but we can't make one white nor black. Nor by worrying can we add one cubit to our stature. Panic and agitation are tools of the enemy. Peace is a fruit of the Holy Ghost.
So what is the point of posting every 30 seconds, "WE'RE ALL GONNA DIE!" (in so many words, and in all kinds of ways)? Of course we're all going to die. That's not the point. The point is what happens AFTER, not how to save our skin here.