Hi Grace:
I'm sorry to hear of your situation. I would be happy to recommend some resources, because I am in the same situation as your husband, which is in fact how I found PC.
Depression is a big stressful mystery for those who don't feel it, and I can empathize with the confusion that your husband must feel. However, with compassion and education, it is possible to learn to understand the internal struggles that depression causes.
The education doesn't solve the frustration, but it does make it a little easier on the relationship. Anyway, please PM me if you would like to talk more. If your husband is open to seeking a support group for himself, we can discuss that as well.

LMo