you have a couple of problems,
let me address it differently, the reason im answering to this question is that i happen to be a specialist who deals with tmj
problem...i would advise you to see a oral maxillofacial surgeon, who deals with tmj problem...neither a orthodontist or dentist
or orthopaedic surgeon
would help you specifically...due respect to the doctor who is assisting you,
1) yes you have a tmj problem....symptoms what you are experiencing indicates of a dislocated disc, there is a articular disc between the bones of the joint, now this may get dislocated and can impede the path of rotation of joint on opening and closing axis of joint, it snaps when you cross the obstructing disc....and while closing it may obstruct again ...thats the reason you have to adjust your jaw while closing..this may result in disc perforation and close lock jaw(difficult to open the mouth) or vice versa
another side to this if you are only experiencing un interuppted wide mouth opening and then gets locked and you are unable to bring the jaw back to its resting position
then it is dislocation and if you can assist it back then it is subluxation but you have stated you have a problem while only opening then this gets ruled out and disc dislocation seems likely...i can assist you better if i can see you pics with maximum mouth opening from front and pls notice when and where exactly you feel pain and obstruction, xrays will be needed but later a tmj open and close mouth view and if disc is the problem then an mri
2) a lump behind / below your earlobe
seems to be just an enlarged lymph node
...probably due to some infection...while go down in a couple of days antibiotics may help but after an infection is diagnosed..please do not blindly take antibiotics...
will get in touch again after your reply
then i can assist you with the treatment.
dr adarsh desai, oral maxillofacial surgeon and implantologist