I also think you are making a great decision. Have you looked into housing for the disabled? The rents are according to income so you wouldn't have to pay much. I had such a painful time with my toxic mother and I almost didn't go to her funeral. I am pretty certain if I hadn't gone, I wouldn't have cause for regret. I let her manipulate me. My psychiatrist said after I described a lot of incidents that both my parents were sadistic to me. NO WAY DID I DO ALL THAT YOU HAVE DONE FOR YOUR MOTHER. I still can't imagine how you have put up with it this long. I am so sorry you have to deal with so much pain.
I think you are such a wonderful person and deserve happiness and shouldn't allow anyone, except for maybe your dogs which they wouldn't do anyways. to walk all over you and dig your own grave.
Bobby