What treatment for apical periodontitis.

I would like to know how apical periodontitis treated? I have constant jaw pain under the ear lobe and neck since May 2020. I went to multiple doctors and dentists. No relief yet.X-ray normal &dentist spot tooth 46hurts for tapping&biting pressure sensitivity on it. It was so sensitive for biting. I was chewing on it and didn't feel any Sensitivity at home. Felt that sensitivity only in that visit.i was chewing normally on it till that day. He said it could be root fracture. Took CbcT. Nothing found. Told me to get root canal for sensitivity biting pressure. Had Rct in September and crown on Nov. Still the same symptoms for tapping and biting pressure on it. No changes in that.Does root canaled tooth takes such a long time to heal? Why still the same biting pressure sensitivity and tapping pressure? Does it indicate a fracture? My dentist said it could be fracture&asked me to extract it. He said he suspect and might be wrong too.Endo said my PDL was widened in 1st xray before Rct.