It sounds like your husband's behavior has escalated. I don't think you can expect it to get better from this point, only worse. I don't think you want to teach your son that this is what a marriage should look like.
Do what you need to to take care of yourself and your son. If you divorce, of course it will be hard on your son, but it may be the best thing for him in the long run. Only you can make that decision.
I bet you know the answer because you sound smart and aware. Your son will get over the house. Think about how you want him to feel about you and your relationship 5 years from now ... 8 years from now ... 10 years from you. It is likely not going to get better because your husband has a personality issue.