My brother (CA mountains), sister (Northern San Diego suburbs), and I (Upstate NY) all were upside down on our mortgages last year. We all went through short sales. Somehow we (you, me, my siblings, etc.) were convinced that we could afford our houses. Whether it's about home value, your mortgage, job/family situation, city flux, or the whole "blame the industry" thing - it doesn't matter HOW you got there. It's scary as heck. And you're asking a great question.
Do you need your credit rating? What for? What does your future look like, in your heads? (the future you and your husband have together) Think about these questions and ask yourself where you'll go, what you can realistically afford (because it won't be a purchase unless someone co-signs, if you foreclose or do a short sale). Do you mind renting? Do you mind moving?
I have never felt so free as I do now. Money is SUPER tight. We have no credit cards. We have 1 job, 4 people. (2 of them are toddlers). We moved to be closer to my mom. And you know what? We followed a trail we thought would lead to well-being and happiness. And it did! I don't even care that we have no credit, no credit cards, no savings, no house, 1 car instead of 2, and can't EVER order pizza. We are having the time of our lives! We have found "the small stuff" in life and it's fantastic. It was worth every mistake, every penny, every tear, every tongue lashing. It really was.