Hmmm, this is difficult... :( Drastic measures are obviously a last resort. Hopefully we can figure it out!
If you don't mind my asking, what are some of your husband's qualities that made you want to marry him in the first place? Maybe there's something there that can help figure out the best way to deal with this.
This is a silly and simplified example, but let's pretend that your husband needs to move a heavy box that he can't lift by himself, and you are the only person around to help him. He asks for your help, but you don't want to risk chipping a nail, so you tell him that you won't help him carry it, but you will cheer him on from the sides. Well, your husband needs to move the box. Cheering him on won't help him do that. You are basically doing nothing to help him while claiming that you are helping by doing the thing most comfortable for you. That is basically what he is doing to you. You are asking for his help and he is refusing to help you while still being satisfied that he is doing his part. You have come up with multiple ways that he can help you, and he refuses to do a single one of them. How is that being supportive? It's not!
Him saying that it's family tradition to complain about someone and ignore the problem, well...isn't that what he's doing to you right now? Ignoring your problems? I would make it clear to him that is not a family tradition you are willing to inherit for your future family with him, so that should be the last time he says that kind of nonsense to you. (It really makes me so mad when men think that the best solution is to ignore something and expect you to go along with it. My husband has also said stupid things like that. I told him if he wanted to live his life like that, he shouldn't have married me, because it's not happening.)
You are absolutely right that your mental health is important. If he expects you to live in that house and go along with this new life they have thrust upon you, then he needs to start making compromises to make it mentally healthy for you to do so. From how you've explained things, you have made all the compromises in this marriage so far - you moved into a new home, took on a new job, take care of him, etc - so what is he compromising for you?
I think your idea to move out together to make your own family is a great idea and would help solve a lot of issues. Did he explain why he refuses to move out?