I left my work early many times because I couldn't handle my overwhelming emotions. You mentioned something I think feeds your depression, which is when you get angry you keep it to yourself. Every time I do this I get severely depressed. Unfortunately, the only other way to deal with this for me is to let it out, which will then hurt some people. Either case has an unpleasant outcome; either hurting myself or hurting others. Maybe I have to learn some more ways to deal with my anger.