Need help on how to help my husband

My husband recently went through a really really tough time. At the same time his physician abruptly quit. That lead to him not taking his benzos anymore which he had been on for years.

For the past couple of days now he has displayed extreme signs of mania and psychosis. Because of this i cannot get him to understand that something is not going right. He refuses to go to another doctor to get help cause in his mind everything is going amazingly and he‘s being shown the secrets to the universe by god himself.

He gets agressive when i voice my concerns or disbelief or difference in opinion. He thinks the end of the world is here and we have to cut any ties to civilization. He won‘t let me disagree on anything.

How can i get my husband to understand what is happening? Can i get him to understand what is happening?? Will he ever get back to normal if he doesn‘t accept having to take medication? Should i leave for the time being? (He is not as aggressive towards the rest of the family) Will he ever forgive me if i leave for a while?