8PlantLady, Reading that nearly brought me to tears.
I'm so sorry you feel so alone like that. I would try to find another place to live while you finish school. "Toxic" parents have little to offer you while in the midst of their addiction. You need a stable adult you can go to, talk to. The counselors are familiar with these things, don't worry, they have access to programs that can help you. And you are NOT alone, many kids suffer in silence. Never feel ashamed, because it is not your fault. THEY are choosing their lifestyle over you. And I'm sure they love you deeply, but they can't control the addiction. So IMHO you should seek help. That's an awful way to spend your school years.