Pain in tooth for touching and tapping.

I have jaw pain under ear and sife of neck for 2 years now. I saw dentist in 2020 for jaw pain and they checked the teeth. Lower first molar was hurting for tapping and biting pressure on it. Xrays were normal. CBCT scan was taken. Endodontist couldn't find anything wrong. But hurts immediately like throbbing shaking sensitive like feel when they tap on it. So told me to get RCT. I had root canal on it in 2020 since they suspect that tooth is reason for my jaw and neck pain.I have severe constant pain in jaw under ear and neck. Had root canal and no changes. Same tapping and biting pressure pain on it. Seen TMJ specialist,OMFS,neurologist and no relief. TMJ MRI and CT was normal. I saw another Endodontist for second opinion and he told me to do occlusion adjustments. he grinded down that crown & other molars,premolars both sides.No relief but bite is not normal after that& I can't bite down together. Then Endo did retreatment RCT on Jan'22. No relief,same pain& symptoms.gum hurts too