I am so sorry to hear you are going through such a difficult time. There was some excellent advice given and I hope it helps you pick yourself up and move on. Remember that you have to set the right example for your children so they don't allow a man to treat them poorly. It is hard when you have taken a vow and you love the person but he has checked out of the marriage so it is time to move on. I was very young when I went through a divorce and I didn't think I could make it but I learned very quickly that I could survive on my own and take care of my son.
I think you should seek out counceling for yourself to help you get stronger which will help you get through this difficult time. It will also help you in the future to make better choices in a mate. Also, you may want to talk to your doctor about getting something to help you through this time, you may need an antidepressant for a short period of time until things level out. When I went through it my therapist at the time warned me that I would probably choose another man just like my ex unless I made some changes.
You really need to get an attorney as soon as possible so you can get support for your children and yourself. He has figured out a way to keep you hanging so he doesn't have to pay right now. Protect yourself and your children. Keeping a log and writing down the episodes of abuse will help you when the time come to negotiate a settlement.
We are here for you and you can be a strong woman and get through this. I found that every time I have gone through a difficult time I have learned from it and it has made me stronger. Think about what a successful and strong woman would do and then apply it. Hang in there.