Nic, we seem to be in very similar "boat". I also have had GERD problems with chest pain/discomfort (if it is GERD - have no clue anymore) for a year now and NOTHING seems to be helping. EDG done 11 months ago with small hiatal hernia and mild esophagus inflammation. Then, tried Prevacid (once, twide a day), Protonix, Nexium and no PPIs helped. Did gallbladder removal and that did not help either.
Pain in chest area is almost always there and I could not see any correlation with food. Pain warries - from mild discomfort to squeezing, almost unbereable, pain that comes and stays for hours. Did manometry which showed low pressure of LES spicnhter and I think data from PH test was screwed somehow. Pain is almost always associated with joint weakness, especially knees. in general at times feel pretty weak ... don't know why.
Gastro thinks that my symptoms (visited few known gastros) could not come from small hernia/low LES spinchter, but could be related to "visceral sensitivity". I was even recommended to see psychatrist - will try it out, but can't beleive that this could be caused by my mind. I know there could be brain-gut connection, but I don't feel at all that my mind is causing all this pain unless I can do it witthout knowing it.
Hope all of us feel mych better in the upcoming year.