Chewing is very painful two months after deep filling. Multiple appointments have not helped. Is it time for a second opinion?

I had many fillings two months ago at a new dentist. One tooth that had been filled became VERY sensitive when chewing any food. My bite's been adjusted multiple times, but I am still having pain. When I floss between the sensitive tooth and the teeth to either side it hurts, bleeds, and smells. My dentist said it is because of "improper flossing." X-rays were taken, but the worker doing them had trouble getting a picture of the correct tooth, & the dentist did not seem to look at them.

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