Hi Stacy!
I often get unexplained "throbbing" in my teeth. No dentist has been able to explain it. Sometimes it could be from clenching so occassionally I wear a mouth guard the dentist made for me. But sometimes that doesn't help either.
I don't have the sore achy muscles in my upper arm. but did have a time with my right forearm. The doc treated it as Tennis elbow, and so sometimes I wear an elbow splint, that I picked up from the drugstore. And ice the area if it's really bad.
Sorry that you are having unusual pains in your body. It's hard to know if it's AS related or not.
Hope you feel better soon!
Laura