I think you are like most of us out here. I am scared to death at what is happening to our economy and would be devastated by the loss of any more income. It was only August that I lost $750/month and that has been tough to deal with.
I would not jump to trying to sell your home as you will find that the market is so poor that even if you could sell it right now, you'd probably be taking a loss on it. I have been in that situation once and regret our decision to this day and it was 18 years ago. We broke even on the sale of our home, walked away with nothing in our pockets and ended up paying more in rent than we did a house payment. Now the house payment I have for a very comparable home is almost 3 times as much as that first house payment was. It kills me.
I think the best thing for you to do is to try to bring in some income yourself. If you could tolerate doing childcare for even a couple of children on a full time basis you can make about $250/week. It feels good to know you are helping and the kids usually enjoy having built in playmates so to speak. Then if your husband's business picks back up you can either continue and just have expendable income or you could stop doing it and go back to being a SAHM.
If daycare isn't your thing then maybe you could find some other type of work that could be done from home. Just be careful of all the scams out there.
Good luck to you.