(OP here) Thanks for the helpful responses.
I guess, for me, the question boils down to: if I have the desire to confess everything possible at my next confession but, my confessor is telling me not to confess any past sins (even if I may have forgotten to confess them previously) other than those from the previous week or, anyway, curtails what I wish to confess, does that still count as omitting things from the confession? I would think that it wouldn't, considering the circuмstances but, I basically want to avoid unworthily receiving Holy Communion, thereby, committing a sacrilege.