I don't know what to do about my job

It is, and had been making my depression about a million times worse. It's turned me into a miserable, angry person who spends a lot of her lunch breaks crying in the bathroom. Not just then either, I cry before I go in, I cry after, I just don't know what to do. My boss has admitted she considers herself a jerk, knows she has a bad attitude, and you have to constantly walk on eggshells around her. The communication all around is piss-poor, the hours are a joke, I get yelled at for things other people did...I could write a very long essay about all the reasons why my workplace sucks.

I'm so tempted to just put in my two weeks notice without anything lined up, even though that's stupid. I want to ask if I can reduce my hours to part-time but I'm not sure if they'd fight me on that considering we're constantly understaffed. But how am I supposed to to get healthier mentally when the place I spend 40-50 hours a week at makes me feel so fucking horrible? I don't know what to do, but something has to change. Just thinking about going in tomorrow morning makes me want to puke.