What he's doing is called "stonewalling" which is a term used by social psychologists -- basically means that he's shutting out what your saying and completely disregarding it. It's one of the 4 key elements of a toxic relationship :/

I think you need to stop making excuses for him and address the core issues. You shouldn't have to be talking to HIS psychiatrist about what you can do to protect yourself.

I'm super sorry this is happening, I hope you're able to find a way to resolve this issue in your relationship.