Basically, I tricked myself into taking care of myself by taking care of other things. In undergrad I had a betta fish, and now in my apartment I have houseplants. And I mean I have over 40 of them. When I get super depressed, the first things to go are personal hygiene and eating, and it takes me about an hour to decide if I want to get out of bed or not, and if I even can. But! Can't stay in bed because I don't want my plants to die! Couldn't stay in bed because I had to get up and clean my fish tank and feed her! And once I'm out of bed, I guess I can make myself brush my teeth and try to eat something small. Maybe I can make a coffee and I can go out and sit on my balcony for a while. Maybe I can even shower and clean a little.

I'm not saying this will work for everyone, but it's been a pretty decent help for me :)