Shay, it sounds like you are hanging in there like me. I know how hard it is to be in "limbo." That's where I've been living for over a year now. It sucks and there are times when I am very close to saying "I'm not doing this anymore", but then I'm reminded of the other option (divorce) which is a lot less palatable. So, for right now, "the lesser of the evils" keeps me in this. Oh, and love and hope.
Anyway, as you already know, your H is suffering from pretty severe depression. Depression almost always comes and goes in episodes. So at times he will seem "normal" while at other times it will seem like he is a different person. The good news is he is coming around to admitting that he is depressed. The bad news is it may take a while before he does anything about it.
Please keep focusing on yourself. I see a lot of love and hope in your situation despite all of the day to day crap.