Kate, when my DH lost his job and was depressed, I pushed him a LOT to get out there and apply for things and do something, anything. He only started to feel better once he had a job...and it was not a cool job or anything like that and didn't require a degree and he has a masters. But just getting out the house, having to get dressed several times a week and getting to talk to someone other than me...was vital. Even though when he didn't work, he took care of the cooking and cleaning and errands, he didn't feel useful and like he was a loser (it was NOT his fault he lost his job). I currently bring home almost double what he does...but the fact that he brings home money is huge to him. We could live off mine alone but it would be tight. His income allows us to have the lifestyle we want. But so much more than that is the what having a job to go to did for his sense of self.
DH has even said that if we ever do win the lottery (fat chance but we dream!)...that he quit working and go to school for finance so he could manage our money. And after that he would still want to work even if it was as a volunteer...at least do something part-time.
It was VERY hard to be married to a person dealing with depression.