D..
Rachel, you need to get to a good divorce attorney. He or she will tell you every thing you need to get. It will include a copy of your husband's business benefits, 401-K and pension, medical, etc., credit card statements (not just the numbers), tax statements, social security cards, DL numbers, etc. You need to get a legal separation and let the attorney keep you from being responsible for your husband's debts. The attorney can make sure that your husband doesn't drop you and the children from his company's medical plan, too.
You need a separate bank account and you need to put money from the joint account into the separate one. (Use a different bank.) You need your own credit card too, and you need to get your name off of his credit cards.
The attorney will help you. It's too important to NOT do this - sometimes husbands take away all the funds and try to "starve out" the wives in order to get them to agree to a small settlement. You don't want this to happen to you.
If, for some reason, you two DO reconcile, it won't matter that you protected yourself. If you don't, it will make a huge difference that you did.
Good luck,
Dawn