Dear Overcomer:
I understand how frustrated and even cornered you must feel. And I did not see, honestly, anyone here jumping on you. It is not fair, OC, to say that to people who are only trying to help you, and moreover, trying to help you see a little more clearly.
I think I can say that everyone here feels that for you, and understand your plight. No one is saying you must dash out the door this very evening. Your new business venture may work very well, but... you need not to be an emotional wreck in order to be able to put your heart and soul into this business (or indeed into any business you might decide on). And you do not stand a chance with the millstones around your neck. You do need to get your ducks in a row, and no one would say otherwise. But it is impossible to discuss anything rationally with your M, or with your alcoholic husband. No one here can tell you to file tomorrow for a divorce, or what to do about your mother.
OC, it is not about "making a point". It is about you and your ultimate survival, your future as a person, and indeed even your physical health. These levels of stress are not good for you. You need to be fair to yourself. No one is saying sell the house and move to an apartment. You say you bought the house, so I am assuming it is in your name.
Could I, maybe, make a suggestion? Could you possibly go see an advisor on the practicalities? And also see someone else to counsel you a little.
Here for us, on this group, it is hard because we cannot actually see you, and you cannot see us. Our words can be misconstrued, but we do care.
BTW you can be emotionally healthy without money and without a job. It happens to people all the time. I know, I have been there. Because of the emotional and mental battering you are getting from your M and H, and your situation, your self-confidence is down in the pits. These people work on you to make you like that. Your husband does not have a wife; he has a slave, and he does nothing. And he won't, until he gets a good fright, maybe.
One door closes and another opens. I realise you have an autistic child to think of. It is not easy.
But, only you can take time out to think profoundly, and perhaps it would be well to try to talk these things through with someone there in "real life", and see what way you can turn.
All the very best
Hermes