I feel for you & don't mean to make light of your situation. I was married for 26 years, happily, or so I thought. Worked side by side with him, in his family's business during all but two of those years. In 3 years time, I lost my mother, he lost his dad. The business was then controlled by his mother who put his younger drunken brother in charge. Then she passed away. We lost everyting we had worked for. I took the funds my mother left me to pay for an attorney to protect his inheirance. Once it got closer to that time, he told me that he had been miserable for the past 5 years & wanted out. Come to find out, he had been seeing his brother's ex wife during most of that time.
Then, he filed a Chapter 13 & forced me into a Chapter 7. Once he was sure he was getting his money, he had his BK dismissed. I lost my home (that I planned & we built) most of everything I had collected in 26 years as well as my husband. So please don't think things can't get worse. But there is light at the end of most tunnels. Just forge on, you'll get through this.
If you can't afford your budget, cut back to the bare bones. Try not to loose your home as most places you'll find to rent cost as much if not more when you consider the tax breaks. Does your husband have insurance? Make sure he adds the children to his policy. Once the divorce is settled & if you are able to stay in the home, you could always rent out a room to help make ends meet. Good luck & keep your head up high.