I know what you're talking about. It's awful. You are not alone. It's hard not to feel bad about yourself. Well, it's impossible not to feel bad about yourself.
I get episodes like that. Sometimes it stretches into a prolonged interval, and it seems like it might never end. I hope your current state of mind improves. It would be great if you could just will it away. That's not something I'll ask you to do because I know better.