Your problem seems to be related to TMJ. Have you tried taking any muscle relaxant like Powergesic-MR
Does it help reducing your pain?
You need to consult Neuromuscular surgeon or neurosurgeon.
Oral surgeon consultation is required for your jaw pain
Next Steps
Please visit oral surgeon, they will further guide you
Health Tips
avoid opening your mouth too wide. if any therapy is helping you relieving your pain then it is good.