I'm taking only 1 gabapentin daily and not the prescribed 3. I'm also weaning off xanax. Down to 1/2 mg daily. I do have issues with my back so it very well could be coming from my back. Honestly, I believe it's injury to phrenic nerve. It's just too much of a coincidence that the vibrations would start the exact time I swallowed a huge gulp of air when taking meds and had pain at end of esophagus for 2 days. I googled internal vibrations then and it said that vibrations could be caused by, along with many other things, injury to phrenic nerve which can be the result of swallowing huge amount of air. I have googled diaphragmatic spasms and it fits with what I have. There is an exercise to do that stops them and that works sometimes. Whatever it is, the gabapentin seems to be calming it down. Addictive or not, what meds aren't these days?...the gabapentin is working, for now.
As for the omeprozole, that's why doctor went to 20mg from 40mg. I stopped them once and after 1 day I had indigestion so bad I wanted to puke. Baking soda works good too. Apple cider vinegar got rid of kidney stones and is very hard on the stomach. That'll eat your stomach lining. If it'll dissolve calcium deposits, you know it's got to be harsh on the stomach.