Yes, I agree with others.
There is no "managing" this person and his mother sounds like an enabling accomplice.
Things will get worse and you may end up permanently harmed (back issues) or dead.
You may not want to hear this kind of advice because it means acting. But my understanding is that women's shelters do take in people in immediate danger,
so I suggest you do something to take care of yourself here. We can only advise, but you must choose to listen and act.
I do wish you the best, but I honestly think you are in some serious denial if you think you can wait around and find a job, save money and not possibly get hurt by this person during that time.
Please take care and keep posting.