i feel for you, and i can relate.
the bad news is that there is a decent chance you will have to be your own advocate. as others have said, for a variety of reasons, the people in our lives are sometimes unable or unwilling to come through in the way we want them to.
the good news is that it is your birthright to feel well, and the power to do so is inside you. i really believe this. it can be difficult to locate that power sometimes, but it is there. lean on the resources that are available to you: crisis hotline, hospitalization, SR, AA. i have gotten a lot of relief from books available at the library.
i hope you can believe, and agree, that there is a solution. don't give up!!