I have been on Prednisone for a year and had most of the side eff...

I have been on Prednisone for a year and had most of the side effects already mentioned. At Christmas I started to get an ache in my rib area when ever I lay down and if I turned over to my other side the ache would fall to that side, the only way I can explain the feeling is, my lungs felt too large for my rib cage..and then the ribs felt tender. A few weeks later I sneezed and a muscle in my back went into a locked spasms and I had to have oxygen to help me breath. Over the months I still had this strange tenderness in the rib area, a chest x-ray showed my lungs were fine...now this tenderness has worsened and my muscles go into spasm as and when they feel like it...My doctor says it is inflammation of the muscles between the ribs and has changed my NSAID without any results so far...has anyone else had these symptoms ? I'm on 5mg a day now from 15mg for Atypical rheumatoid arthritis.