13 fillings of anykind and a root canal point to the jaw being the issue. I would seek a opinion of a biological dentist-one who didn't place the fillings or root canal. If we knew each other I would bet my entire 401k on dental in this case
Just one mans opinion.
I have had dental issues and as I fixed the my healt dramatically improved. I would seek out Dr. Mike Margolis and get a cavitat scan