Rheumatoid Arthritis Treatment

the name??? can anyone help?

I have rheumatoid arthritis and work for a medical clinic. I do just fine if I don’t do things that aggrevate my condition which is climbing stairs. We have two offices, one upstairs (with no elevator and 24 stairs straight up) and one downstairs. I’m one of three receptionist and the doctors make us rotate between offices. I have RA in both feet and my knees and after climbing stairs I’m usually in pain for a couple days after. If I totally refuse to do their rotation, can they legally fire me, even though I do everything else that they ask of me?

I am 28 yrs old and I can’t take the pain. My doctor wants to do a bone scan tomorrow and will probably start me one some rheumatic drugs. I am already taking the max on celebrx. I am always crying and cant seem to concentrate. I am also extremely fatique. I can seem to find someone to talk too. My best friend is busy with her 4 kids and my boyfriend is busy at work. I just called him and he could not take 5 minutes out of his busy schedule to take to me as i break down and cry.
I do not know what to do. I want the pain to go away. Please
help. I have always been a very upbeat person always smiling….now i can remember the last time i smiled and laughed.