DAICY, this and your initial post speak "depression" to me, but I cannot diagnose. Additionally, you are not yet a legal adult and, ironically, your mother the nurse is hostile to your receiving a mental health diagnosis and medications (did I read that correctly?). All these limit your options -- limit, not eliminate.

Do what you can do, and try not to bother about what you can't. Is there anyone at your school to whom you can freely reveal the information you've posted here?