I know he is an idiot. And lots of other things. I think focusing on your self and the kids will help the time pass. Be the best cookie you can be. Keep your dignity. Keep your respect for yourself. You have helped a lot of people, and I hope we have all helped you a little, too.
You can still do this gracefully. You'll feel a lot better about it. Our situations are different, in that my W is not acting at all like your H, but other than that our paths our similar. So, keep looking at the positives in you. You will be fine!