I've been dealing with similar stuff on and off for years. Been to doc 3 or 4 times since 1993. Had treadmill test 3 times, nothing.
Now in the past 6 months or so it has been more frequent & more annoying. Then I got a full blown case of GERD. Did a course of Prilosec which seemed to help. That was about a month ago. The symptoms have come back.
Just got 200 pills of generic off ebay and started on them again Tuesday
I found that doing a hard workout makes me feel better and the weird sensations go away for awhile.
Saw doc yesterday & he didn't seem concerned and told me to keep on with what I'm doing. So I killed my self
I will trying drinking Gatorade to see if it is the electrolyte levels.
Very informative thread