Wow. You're working? Under stress?? Depressed?? Give this person some applause!! Hell, that's more than many NON depressd people can do!
I have been there (and am sort of going through the same thing again) and this is my take on it: depression runs in cycles, and you're in a cycle. Doesn't mean it will stay that way.
Do yourself a big favor and stop giving emotions so much control. You aren't what you feel...none of us are.
The best advice I can give to you right now is to end each day on a single good note. The worst depression I ever had, I would do that. Slept all day...but I'd get up and grab a shower. Didn't want to eat, but ended the day eating something (anything). I went for walks when I didn't want to, then go to sleep. No, I didn't really enjoy the walk but I knew there was a part of my body that needed it anyway. Evvery night, I tried to do just one small thing good for myself at the end of every day before I went to bed. Just one thing. And incredibly, it helped. I mean at least as much as any med did, which is saying a lot, actually.
So try that. And hang in there. Look, I've been there, and trust me...things will get better, okay?? No, you don't know me, but that's okay too. One day at a time.