Okay, when I was dealing with this, I got on a site called flylady.com
These people actually are going through the same thing...some with mental illness and some just struggling with problems cleaning.
You will find a lot of support there. She has a simple (very simple) routine and you add a baby step per day. I mean these are baby steps..not hard at all. In short order, I had the house cleaned up and even my cupboards and closets cleaned out. It was actually good therapy for my severe depression. Try to plan to do one fun thing with your baby every day. Coloring, or singing and dancing while holding him, doing and exercise while holding him (depending on his age). You can be a good mom while depressed. And it gets your mind off of things. PM me anytime..I remember being in your shoes and it was really tough.