When I googled polymyositis I got a ton of references. Most all of them listed pain in the proximal muscles as a symptom.

I had muscle cramping and weakness that I thought was due to my having MS. I went to the neuro and told her I had weakness in my jaw. That meant something to her so she ordered the CPK. It came back high so she started looking at PM. I still think the weakness was MS related because the pain in my leg was different. When I started having pain in my arm I went to my PCP. She said it was typical of PM so I guess pain is a symptom.

I hope you find out what is going on soon. There is nothing worse than knowing something is wrong and not knowing what. It can drive a person crazy.