Annie, Yes, you do need to get help right away if you have an infection. Are you sure you don't just have inflammation? I believe myositis is an inflammatory condition, not infectious. Of course, you could have an infection in addition to the myositis. I'm no doctor (obviously), but if you are in a lot of pain and especially if you have a fever you need to be seen now!!

I agree that forcing a diagnosis is the wrong way to go. Not only could you kill yourself in the process, but chances are the doctor wont change his mind anyway.

Good luck with everything.