Hi timeforachange, it will be a huge relief to have the large duck out of your company, and put someone in there who contributes to your bottom line. If he has access to money I imagine it will be a complicated process, but I'm sure you and your attorney are capable.
If you can afford it, consider getting some reliable help to see you through this period. You've taken on a lot, with the baby, the business and your marriage. I don't know you, but if you have the tendency to want to do it all, try to overcome it for your own sake. Maybe you have a relative you trust who can lend a hand with the family side of things?
It's possible to ask your husband to take a drug/alcohol test before he sees the children unsupervised, or maybe a relative could stand in for you?