I think I have some of the symptoms of an ovarian cyst, but I don't know what to tell my mom because I know she refuses to take me to an ob/gyn. is it possible to treat ovarian cyst symptoms without having to see a doctor? At what point might a doctor visit be necessary?

There is nothing you can do about it at home. If you firmly believe you have a medical problem tell your mother what you think is happening and why you think it. neither you nor her are qualified to diagnose a medical condition, let alone treat it.

If she refuses to take you to the doctor have a talk with your school health nurse or a member of the school faculty about the situation. they will help you get the medical help you may need.