A.L.
I would say first off, IF you don't want to be singled out because you have a medical issue, then, you shouldn't start suggesting that your employer is prejudice.. Because by doing that, it's a BIG statement and unless you have true non-biased proof, I would stop throwing that word around. In turn, IF you truly feel you have been wronged , then begin to document each situation.. Also, you state you have good reviews to prove your good work, then ok, that Is a good thing. You have some proof in the pudding. But do realize, this new supervisor still needs to see how you currently work. Also, the supervisor being NEW to the role, could be this lady's A@@ is on the line if the job overall isn't completed. Sometimes, things aren't as personal as we like to think. Again, IF you have actual , factual proof.. then write it down and DO report it..
best of luck to you