I'm so sorry this happened to you.
If you haven't before, please consider getting counseling. Contact RAINN - https://www.rainn.org/about-national-sexual-assault-telephone-hotline - 800.656.HOPE (4673). They will connect you with a Rape Crisis Center in your area. Assuming you are over 18, they will not make you report it if you do not want to. (If you are under 18, remain anonymous.)
That said, do you think you could go to the gyno if your friend goes with you and holds your hand? It would be a good idea to rule out any nerve damage at the same time you are getting counseling. Even if it wasn't from over-stimulating it over and over, perhaps there was trauma at one point that caused some injury.
It may be purely an emotional reaction, too. Even doing it to yourself may be bringing back memories, or you may be feeling really anxious that you can't orgasm, causing a cycle of anxiety/pressure/no orgasm.
It could also be a combination of some really irritated/sensitive/damaged nerves and PTSD or an emotional reaction as well, so talk to your doctor, and a counselor. You deserve to approach this from all angles, and deserve to have the happiest, healthiest, safest sex life you can.
If you can get to a gyno, let us know what happens. Maybe someone at your local rape crisis center can refer you to one who is sensitive with assault trauma.
Best to you.
The same thing happened to me just once though on a one night stand, my clitoris is now quite sore and very sensitive and don't want to touch it I'm scared it has been damaged also.