Sore and tender pain in tooth and gum.

Hi, I had root canal on lower first molar in September. No infection. That tooth was hurting a little and sensitive to tapping and biting. So the dentist suspect a tooth root fracture. I went to Endo. Endo couldn't see anything in x-ray, but recommended RCT since that tooth was sensitive and hurts for tapping and biting. I went to the dentist to check my lower jaw and neck pain. He suspect that this lower molar if the reason for that pain. I did rct and crown. I still have same symptoms in lower jaw under ear and neck. Went back to Endo. He took CBCT scan. He tapped on the tooth. That hurts. Biting on bite sloth hurts. He is not sure why I have same pain even after rct. He is also not sure if this tooth is the reason for my lower jaw pain. I have this pain for 9 months now. I also have sore pain on that Tooth and gum. What does it Indicate if tooth hurts for tapping and biting? Does it mean RCT failed? Do I need to redo it?My Endo wants me to redo the RCT whereas dentist want to ext.