I hope you have gotten some relief since your last post.
I know you love your husband, and feel responsible for him, but I think you and your son should leave, I say this as someone who was married to a paranoid sz person for 13 years.
Don't subject yourself to his hateful rhetoric. And Ithink it's only a matter of time until he shares his delusions with your son.
If I were you, I'd make an escape plan to stay with a relative, a friend, or even a hotel or women's shelter. Don't tell your husband about it. Call him when you get settled, and make the case that he must agree to /start medical treatment before you consider moving back in w him.
I sorry if I sound harsh, but you have to think about you and your son. You don't want to get more stressed, tired, etc.