Cramp like tooth pain to hot foods.light tapping causes ache. xrays shows nothing. endo say root canal not necessary. am uncomfortable, what next?

Sensitivity paste: You have already had an endodontist evaluate the tooth. You might try the new crest sensitivity strips or Sensodyne toothpaste (or any sensitivity brand) to see if it helps alleviate some of the sensitivity. Sometimes recession areas can cause some pretty uncomfortable pain. Sensitivity pastes do need to build up over a couple of weeks to be effective, so give it time.

See Prosthodontist: See a Prosthodontist to evaluate your bite. You may be overloading the tooth with normal closing or when you go into parafunction. Might have a "crossover interference" . Many possibilities. See the specialist in reconstruction and occlusion (bite). Good Luck.

Endo second opinion: In many cases, seeking a second opinion is not only warranted, but necessary. Unless your disease is life threatening and requires emergency care, it is never a bad idea to seek a second opinion. Getting a second opinion helps you feel more confident about your diagnosis and treatment plan. See a board certified endodontist.