I am on Gabapentin (Neurontin) to relieve me of the jaw clenching and other muscle tension problems I am having. It is a very easy drug to take. No real side effects.
It is an adjunct anti-epileptic. It effects GABA in a positive way.

Has anybody done a "good" look at your neck? The vertebral artery is known to cause problems with the eighth cranial nerve that connects to the ear. One of the articles refers to 0.3 millimeter slices needed for the MRI to image the problem.

Do a google for "cranial nerves, vertebra" You will find some good information.

I have a problem with inflammation in the brain stem causing problems. For me, it effects the autonomic nervous system and causes me to stop breathing.

Maybe you have a problem in the neck too.

Good luck with this problem.