Hi, Kwiklip, and welcome! Those symptoms do not sound like any I've heard with fibro. I don't know anything about polymyositis so I'm really no help here. What I would suggest is to see yet another doctor for a second opinion. It's terrible that this doctor is ignoring you, basically.
Be sure to read Fibro 101...the second thread on the forum. There are links to good info about fibro and you will learn a lot there. There is a good link called Symptoms that might really interest you.
I'm looking forward to getting to know you better. Don't hesitate to ask questions because we are here to help you. Hope to hear more from you soon.
Sherrline