Wow! Time now to tell your story to a matrimonial lawyer, get proper legal advice and take action to protect yourself for the future. Don’t waste any more time on him, you need to look to that future.
And, look on the bright side : you have all the details, especially all the important financial ones. It doesn’t matter how he sneers, puts you down, rants or brags - and you shouldn’t care if he’s showing ‘early signs’ of anything or you feel he should seek medical advice. Forget all that, just get advice and focus on organising a way out of your stressful and unpleasant life. You’ve worked at building a good life for both of you. There’s no reason why you should now do anything, accept things, or move anywhere that you don’t want.
At least half of the monies amassed in this long marriage is your entitlement, so go and get help and advice. Don’t let him and this latest bad behaviour wear you down.
Never give up…..it’s your time now. Good luck.