I agree with the previous posts that your symptoms are all in line with TMJ disorders. Seems that you have ruled out the potential for medical issues, and that always should be the first step.
To explain why this all seems to have happened now all of a sudden, it could have been that something triggered symptoms now, as with any disease process symptoms are the last 20% of any disease. It sounds to me that you have cervical problems and issues now. Seek a good A.O. chiropractor or D.O. or physical therapist and get an adjustment. This shold make you feel better in the short run. then see a Nueromuscular dentist to stabilize your joint and fix it for good.
Hope this helps.
i feel the exact same way,i have tmj also, i have not yet been to the doctor for an mri yet. did you ever figure it out yet?
Your symptoms could be associated with tomporomandibular disorder. However, ruling out strucural pathology by medical professionals are essential.