How to know if I haveTMJD? Pan xray.

I have lower jaw pain, ear pain, pain under the right ear with Swelling in lower jaw for more than 2 months. Been to ENT, dentist, oral surgeon. No infection in sinus and ear. Dentist said it could be upper wisdom tooth or tooth crack in lower first molar#46. But he is not sure if I have a tooth crack/fracture. Told me to extract #46  it as RCT will not bw successful for crack.i didn't extract it yet. Now I have pain in side of neck with mild swelling and sore pain on top side of the head.Went to OS and removed upper wisdom tooth a month back.Still pain in lower jaw,ear, under ear, neck and top side of head. OS said it's TMJ pain and told me to try splint or physical therapy. The splint from tmj specialist is expensive here in the USA.He took pan xray and said I have tmd. Can we diagnose tmd with pan xray? He said my disc is dislocated.i have Continuous pain inside the ear, under the ear where jaw ends, neck and top right side of head.My neck and lower jaw is swollen.what to do next?