I can't offer any better advice then has already been given, but I can offer encouragement. We've been there, and not long ago at all. 3 years ago we were unemployed, in foreclosure, our business had gone belly up and we were 300k in debt. We also have 5 kids, with one starting college. Not the happiest time in my life.
How do you fight such a monster? As Sean Connery says in Highlander "With heart and faith and steel" Good advice when you're in a battle for your (financial) life.
I applied much of the advice given in this thread. It was painful in the extreme. We had to give our house back to the bank, a house I remodeled myself over 15 years, and raised my kids in- that was the worst experience of my life.
We sold everything that was worth anything, including my prized Mini cooper S -I loved that car!
Mostly I got a job, moved to a very cheap house, in fact our house was condemned when we bought it, now it's half way livable due entirely to sweat equity, only costs $500 a month, and it will be paid off in 6 years.
In addition to my full time job I took on part time contract work, and it made a huge difference. I took a occasional job fixing exercise equipment. simple pull the old part install the new part stuff, only paid $60 per visit, but you wouldn't believe how much an extra $200-$300 helped and I could make my own hours. We didn't budget it, it just padded the checking account now and then, and it made a big difference. I now have two part time jobs plus my full time job and my wife works 3 nights a week as a telemarketer (no flames please!

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We did and are doing the whole 'live like no one else' thing, and it works.
3 years in we only have about 55k in debt, and our outgo is much less than our income. Things are good enough that we are actually going to Disney this fall and taking my parents. Super budget trip, but all paid for in cash up front. We could pay off the rest of the debt quicker if we didn't go, but for various reasons this is the time for us, so we're going.
Don't give up. It's a battle for your life and your family. You gotta man up, get angry, get tough, and do what you gotta do. Heart, faith and steel and you'll beat this monster!