If you were fired or at the least written up I understand hiring an attorney to dispute it or demand compensation. I doubt you can hire an attorney to dispute being asked to be “upbeat”. What are you asking in regards to taking legal routes? Monetary compensation? For making feel uncomfortable?

Did you formally request accommodations based on your diagnosis and were denied? Doctor’s letter? Etc? Her knowing your diagnosis might not mean anything as she might not fully understand it. Did your psychiatrist provide a letter with formal requests?

This place is absolutely insane. I have never heard such things taking place. I mean demanding you be upbeat and participate in social stuff. It’s insane. But it’s just a bad fit. What would you sue for?

I’d leave and look for a better fit. Or go on medical leave right now if your doctor thinks staying another two weeks is detrimental.