i understand where you are coming from and sympathize that you're feeling so stressed over this. it is good that you are speaking up for yourself....it can be hard to do that. bravo!
my advice would be to establish your boundaries, firmly, and put the people on ignore that you need to. if you do that, you won't receive PMs from them. it works for me!!!
it's great that you do want to help everyone, but at some time, like now, you do come to realize that you have to take care of yourself first.....xoxoxo pat