Different Endo opinions. Do I need RCT?

My symptoms are,severe burning sore pain in the lower jaw under earlobe and on the side of the neck since may. Mild Swelling in the lower jaw and neck. I have small pea size lump on the neck along with mild swelling. Sore ear pain with mild swelling.i went to ENT and no Infection in ear and sinus. I went to dentist and no infection in any tooth. He told me to extract upper wisdom tooth and I did that 2 months back and same symptoms still. dentist said I might have tooth fracture on lower first molar and told me to RCT or extract it. But crack is not visible on x-ray and cbct scan. I went to the Endodontist. He said no fracture, but tooth is little cold sensitive. I had sore pain for 20secs after cold spray test. Tender and sensitivity to bite on one spot on that tooth.so he said to do RCT. I went for second Endo opinion. He said tooth is healthy and not RCT required. It's kind of confusing if I need RCT or not. How to know if I have a crack, fracture or root fracture? should I try RCT?