I don't know what to say. If you have read my thread I am not the best at DBing. I have made the wrong move at every decision point in my situation. Maybe I am sabotaging myself in a subconsious way. Who knows.
I think your best bet is to copy and post your situation in a thread of your own. There are a lot of really wise and experienced people here and they will come to your aid.
The one thing I will tell you is that you will be the rock for you family. Your husband is going through something bizarr and you need to shift the focus onto your kids. They didn't do anything to deserve this. Your husband has made a decision. The depression may come and go but your kids deserve to have a strong parent in their corner. Once you get a foundation for them and you then maybe take some time to worry about him.
I'll look for your post and visit it. So sorry for your situation but I think you have found a good place to help a little by being here.