I recently went through a virus with exactly the symptoms you describe. Not ONE thing in my alternative health arsenal helped me, and finally in desperation I tried Western Medicine, and that didn't help either. I was beside myself. Finally I just had to let the damn thing run it's course. I think I coughed for like 2 months, which did not help my costochondritis (inflammation of the ribs). I'm telling you IT SUCKED.
So, I would wait to see if you have one of these screwy viruses going around before you decide it's a dental thingy.