Hi, PattyD! Ah, coworkers and bosses - it's so much easier for people to deride than attempt to understand.

When I last worked, the knowledge I was being seen at a mental health clinic was impossible to hide. It damaged professional relationships from the start. My supervisors held me in suspicion and distrust. Ultimately, it contributed greatly to my decline and the end of my career. I do not have good memories of that time.
That's a good plan. As your mood and situation permit, you might attempt to toss a few smiles and kind comments at your coworkers regardless of how they've been treating you. If nothing else, that will contribute to your workplace "aura of mystery" and stimulate different treatment. If they begin to relate to you better, great. If worse, great -- document their behavior ("evidence of a hostile work environment") and send it up the chain.