I used to get them on Remi. It was so bad that I had to take Tylenol Arthritis to ease the pain. It would be so bad at times that I couldn't walk.
With that said, talk to you doctor. My doctor believed that it was the start of developing the antibodies and took me off the Remi. Once I went off, the pain never came back.
I hope you feel better. I remember the pain like it was yesterday. It would last almost a week. I wouldn't wish that on anyone and I am sorry you have to go through that.