I haven't rtft but I've read all your posts, OP.
Last weekend I ended up punching myself in the head because it all got too much. Meanwhile, he calls his parents and calls 999, because he was concerned about me
My head is just not right anymore I can’t remember a time it was
Believe it or not, this is proof that your head is right. It's proof that you are arguing for your truth, that you know your boundaries, and you know that they are being willfully crossed, time and again, by someone who is supposed to love you.
Your head is fine. You will know it the second you're away from him. You may have stuff to deal with, but you're nothing like as screwed as you think you are. You sound sane, and together. You sound sensible, but driven to the point of despair. You sound like you need a fucking break.
Right now, don't worry about the long job of getting out. Get out, first, psychologically. You'll slip quietly out the side door, psychologically, holding your sanity lovingly by the hand, and he won't even know you've gone.
This is how you do it: Your first assumption from now on is always that he is wrong, and you are right. That's something that you just know, from here on in. You know it like you know the sky is blue and hats go on heads. So, in the same way that if he told you that hats go on hands, you wouldn't get into an argument about it, you would just assume he's lost his marbles, that's how you deal with it when he invalidates you emotionally. You know your truth. Anybody, including him, can have an opinion about it, they can choose whether it's their truth or not. Doesn't matter. Your feelings are your own. Nobody can tell you different, because nobody knows what they feel like except you. Your feelings are the only place in the world where you have full and complete authority.
Don't argue with him, don't justify yourself, don't correct him. If he wants to believe that hats go on hands, that's up to him. If he wants to believe that your feelings are not to be respected, again, that's up to him: He can think what he likes.
But you know you. And that's where the strength is that will power your recovery. You can absolutely do it, and you're ready: That's why you posted here.