Sorry your parents aren't getting it. And good for you that you are still advocating for yourself, you should be proud that you are trying to keep yourself healthy even without support. I wonder, is there a counselor or nurse at your school that you feel comfortable talking to? I'm not sure what the situation is there, so please don't take that as a suggestion, just something to consider if it feels safe. Also, do you have a family doctor you could get an appointment with and ask for help? It may be that your parents need information from an authority figure to come to a place where they take it seriously. Keep trying and don't give up. You deserve to feel good.