Ya know, I'm not much for advice - either giving it or accepting it. I have the same kind of crashes. I've noticed lately, though, that they don't go as deep or last as long. Maybe it just takes time - and yeah, I used to hate it when people told me that, too. Still do. I want it all, I want it now, and I want it delivered for free. So about the best I can do is assure you that I know what it feels like, it sucks, and (sorry) it gets better.
I'll add that your feelings aren't anyone's fault. They just are. You're being you. We all love you regardless.
Oh, and I think it's "piercivist."
Stephanie