Oh, my, I am so sorry you are having these problems with getting treatment. Is there anyone you can talk to in the community--such as a minister or pastor, a teacher, a school counselor? Of course, you would hope they wouldn't make it worse for you by talking to your parents and embarrassing them.
You might want to post in the ADHD/ADD forum here. Maybe they can offer some suggestions for coping, especially if you can't get any medications right now. As far as I am concerned, ADHD and the like are not "mental illnesses." At least in the way they are often defined.