toothache with sinus pain

I was wondering if anyone has any advice on toothache. My upper right 2nd molar is in pain. The pain is dull, radioating into the adjacent temple. When I jump or nod my head vigorously, I get sharp pangs; tapping on the chewing surface increases the dull ache slightly, while tapping on the sides is OK. This tooth has a large filling which appears fine; my dentist took an X-ray and said everything looks good. I do have a sinus infection though; my sinuses are hot with pressure and pain on the side of the nose. Other teeth are also affected in that they have wondering pains and aches; in this one however, the pain is more localized, which bothers me. Pain is worse on eating and having anything in the mouth, and slightly better when I hold my cheek. There is some generalized sensitivity to cold. Hypericum 30c helped headache and facial pain slightly. Merc. viv didn't do anything. I have been working hard past few weeks, lost 5 lb which puts me close to being underweight; I feel swamped, run down, slightly spaced out and angry. I'll much appreciate any advice.