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I am glad that you asked this question here and we will be glad to answer it for you.
I think you answered yourself and TMJ syndrome could be a possible reason. You may have to use better pain killers for this. Do you have any other tingling or numbness at the site?
This may also be due to some other injuries in the neck region. Do you recall any?
Also check the pillow and bed that you may be using. Is it too soft or too hard? You may have to change them to check.
Let me know if you may have any other questions.