Pain radiates from beneath my lower left jaw in a knot beside my esophagus. Starts with back lower skull pain or pop. Thoughts?

Examination needed. You could be suffering from a dental occlusion issue or there could be a cervical radiculopathy or entrapped branch of the occipital nerve though your age is against the radiculopathy choice more than the other conditions and an pinched occipital nerve doesn't explain jaw pain very well. Caution to you though on the chiropractic manipulations of the neck. Those can be DANGEROUS. ASK about risks.