If I were discharged from medical treatment due to being gay, is there anything I can do about it?

I have been going to a pain clinic for over a year now. I went to get my next round of injections in my back and took my girlfriend with me so she could drive me home. I had to wait an overly extended time past my scheduled time and went to use the restroom. When I returned they had skipped me because I wasn't in the waiting room technically (even though the bathroom is in there) preceded to wait until finally called. I received a discharge letter two days later for inappropriate and defensive behavior with whom I was with in the waiting room. This was the first visit to this office ever by the way. I called immediately to find out what the problem was and after 25 minutes of continually asking what specifically did I do wrong, the lady's response was that my friends hand was on my crotch, another patient saw it, made them feel uncomfortable, and since I was the patient I shouldn't have let it happen. First off, it did not happen. We were both on our cell phones the entire wait time. I asked if there was video footage to prove it because I know it didn't happen and she said no. I was not spoken to on the spot, and when I asked her if she saw it herself she said no and that another patient complained. So no valid proof, hear say, no warning, first time ever at that office and most importantly my girlfriend never touched me. Is there anything I can do because now I must suffer without my medications? I felt very mistreated, unfair, and when I mentioned to the lady it was nothing more than discrimination against me for being gay, she replied not to throw that crap at her. I said I've been with this clinic for over a year, never had any issue not once and now first time here this happens without any proof or truthful explanation. I need and want help please. I am respectful and do not show any PDA knowing I live in a Bible Belt state and don't want problems. This woman abused her power all because I am gay.