kinda seems to me like you've got yourself tied up in knots...indeed it could be "GERD" some of your symptoms sounds a whole lot like gallbladder trouble.you didn't say how old you are or if you are overweight which are risk factors for GB disease...however most of the symptoms could be attributed to anxiety and panic.....i used to get all the same symptoms as you and just kind of waited around to die...that was about 30 yrs ago...

if you think it could be related to some sort of GERD, go to the pharmacy and pick up some otc prilosec and see if that helps...
if that fails to help at all, then i'd go see a doctor somewhere just to put my mind at rest if nothing else.
hope this helps................................... .......peace