Has there been any talk about putting you into the hospital? Seems to me that would be the best thing for right now. Competent people to take care of you-away from your parents. Even a voluntary psych ward might be better than the situation you are in now.
It sounds as if your depression is escalating and I fear it will get worse for you. Perhaps you could reach out to a crisis line and they will have some suggestios for you. Same thing for your local mental health center.
In the states they have group homes for disabled people-is there anything like that?
I wish you the best and hope you find a solution soon.