Pain in RCT retreated tooth and gum.

I'm dealing with jaw pain under ear area&neck since May 2020.Dentist spotted tooth 46 which hurts for tapping&biting pressure on it during that visit. No pain on that tooth before&I was chewing on it before.Only had pain in the lower jaw under ear,ear pain&neck pain.Sent me to Endo,he said RCT for this tapping &biting pressure sensitivity.Had rct in Sept 2020.No relief.Same symptoms persist.Same Tapping&biting pressure pain on it.Had perm crown&no relief.Same lower jaw end pain&46 pain.46 started aching sore constantly after root canal in the tooth&gum.Seen OMFS,tmj specialist,Neurologist.Nothing found.Dentist told to extract the tooth&see. Saw another Endo few months back,said my distal root is not filled properly&need retreat.Had retreatment in 2 steps.had sealing done 3 weeks ago. No relief yet.Tooth&gum area(near the root of the tip)hurts for touching, brushing and any little pressure on it. Feel like full&pressure.told to extract.taken CBCT&normal. why tooth&gum hurts to touch?