Ummm....he wasn't paying payroll taxes for his employees? And now he has a business that you don't even have any access to his bank accounts or records?
Yeah, find an attorney you like. Don't take anything at face value. Run credit reports on you and H to make sure there isn't a lot of debt that you don't know about. somebody who cheats on his payroll taxes may well be hiding other things from you as well.
Even if you end up reconciling, I don't ever want you to blindly put your financial future in his hands again. It's a bummer to start over again as a single mother, but I would recommend that you start making financial decisions AS IF that is going to be your future. Start squirreling away any cash you can. Pay for things like car repairs and dental work while he's still footing the bill. Get you plan B in place. Do you work outside the home? If not, do you have marketable skills, or do you need to start taking classes? Can you stock up on canned goods and dried foods?