M.T.
Hi E.,
The first onsets of my sinus infections are usually a scratchy throat and teeth/jaw aches. Mine lessen when I lay down, and then when I get up to start the day the jaw bone and back teeth start to get score, almost like itchy and I constantly want to scratch inside my skin on the bone. It is weird, but you would definitely see a specialist.
I was like you and thought my dentist would be able to tell as well, but he said that if it is inside the nasal passages, it is beyond his knowledge. I was inflamed from not treating it for so long, but after a couple weeks of antibiotics, I was fine.