Failed Proctor Exam Because Of My ADHD, Is There Anything I Can Do?

I just got expelled because I got flagged for cheating. Apparently I clearly cheated because I moved too much, looked around constantly and talked through the entire thing. I TRIED to explain; I fidget constantly, I talk to myself especially when I’m trying to focus or work through a problem, and Im pretty sure I haven’t stopped moving since I gained the ability to control my own muscles. They didn’t care. I didn’t seek accommodation for my ADHD because taking the courses online WAS the accommodation. And evidently that means I’m screwed. It seems so insane and frankly ableist. I don’t know if anyone on here can help but I’m just so angry, do I have any grounds to fight this?