Very sad, I can imagine that it must be horrible that after admitting you guys still stay at the same place.
I think you need some space straight away. Maybe there is a way that you can leave for a few days to visit a friend or family?
Best thing would be you tell him that you can't stand the situation right now and that you need some distance to think about what happened. And then again it would be even better if you left without your son. That your H would have to find a way to not NEED you to take care of him. Backing off in the same house ain't enough in this situation I guess. Set a sign/limit to him. He should understand that you NEED that space and a little time out for yourself.
Please do yourself a favour and start thinking about where you could go and who would be some good support for you straight away. Then organize a trip there. And then tell him about your plan. 3-4 days can be fine already. Time enough to read DB. and to come back to confront him with a new YOU.
Will you think about that opportunity? Please.... I'll go visit my best friend tomorrow. I am sooooo much looking forward to it.... You should do the same!