Have you talked this out with your parents? It seems to me that it is time for some adult intervention on your behalf. Your parents might be able to help with the AP classes and the living situation at least. I recognize that many people on this board think kids should be able to “go it alone” but I do not. You are past that point from what you have written.
My heart goes out to you. Are you a member of a team or club? Possibly the coach could be a good resource for you.