Thanks. The thing is, I don't have any pain, just very tight and grating. I should have clarified that, and it's pretty strange that it can be tight with absolutely no pain.
A wonderful doctor I had years ago (pre-diagnosis) used to tell me that what I called "muscle tightness" most people would call muscle pain. She believed, based on a number of odd experiences, that I have a very high tolerance for certain types of pain and that I interpret them as "tightness" or "aches". Maybe you're the same.