We had a rough financial patch when we were a young couple with young kiddos. We were managing our car payment and credit card debt until DH lost his 20 hours of overtime a week (which we were treating like regular income - mistake!). Then one of the kids ended up inn the hospital for 3 weeks. We were overwhelmed.
We sold one car and made do with the other. We moved the credit card debt onto cards with 0 interest options (yes, there were transfer fees, but it was much less in the long run). We shut off the satellite and made use of the public library for our entertainment. We didn't eat out. We bought gifts and clothes from goodwill and consignment stores. We started shopping aldis-type store rather than krogers (not just cheaper, but fewer impulse buys and convenience foods).
With no change to our income, we were back on our feet within two years. And learned a valuable lesson.
OP, you can do this. if you are creative and very, very critical of your spending.
I agree with another poster: You need to work to RENT the business portion of the home. Shoot, give any renter a deal they can't pass up: Even a couple hundred dollars is more than you are making on it now, and they would pay the heat on that portion of the home to keep those pipes from freezing.
Cut, cut, cut your expenses. Be brutal about what you NEED and what you DON'T. Get down and dirty with the food budget, no convenience foods, focus on cheap and filling, etc.
Find part time jobs to increase your income (we didn't, mainly because of the kids), but this will speed up the process if you apply all of it to the debt repayment.
Good Luck.