They can't take your children away just because you're depressed. I know TONS of parents who are in treatment for depression. They can't take them unless you can't care for them or are harming them.

As for your husband, I don't know him but when I was diagnosed my boyfriend at the time was like, "OH, now it makes sense!" My experience is that most people are understanding about it, although to be fair I live in a place where about 1/3 of the polulation has seasonal depression.