I can't go to the doctor because my mom thinks I'm making it up with my ocd

Oh yeah, I got a concussion a year ago. The symptoms lasted for a year because I didn't do anything to treat it. I went to every doctor, and even a concussion specialist, and they all said i didn't have a concussion. I then also had an MRI and that came out saying I have had no concussions ever before. Even at this point I still didn't believe it, and I self diagnosed myself with a concussion. That's why my mom won't take me