I've been made to do a job I did not apply for; it's exacerbated my stress-induced ADD - and caused me extreme stress daily.

I return from 2 wk. leave to have surgery & was told I would be working another day at the job and my hrs. were changing. After two write ups + being told there needs to be some "significant" improvement' & maybe the job isn't a fit. I stated it is not a fit, it's not the job I applied for and I've said I have stress-induced ADD. Then she said she would call HR & we could discuss it. I sent HR a "memo to my file" detailing the job change, stress etc. We met the following day w/ the HR rep asking what accommodation do I feel would be helpful. I stated to be allowed to do the job I applied for/ working for 1 physician and not the 6 physician practice I've been made to work in. I was told the patient volume is not what was expected so the job for the 1 MD is not a full time position now. HR rep said she would get back to us. A week passed; things cont. to be stressful for me. I notified HR - they asked me to take 4 days of to "distress" & give them time to work something out.