I haven't, yet, but if you go to the Digestive Disorders board, there is a "sticky" about GERRAB that I just read. It is full of people sharing their stories about how magnesium has pretty much cured them of all the acid reflux & other pain associated with it, ie abdominal, back & chest pain.
I am personally at the point where I would do just about anything to make it go away, so I know where I'll be going when the health food stores open.
I have also read about "licorice root" and something that's made from it. That, too, it addressed in that particular board.
I hope that helps. I know how horrible it feels to suffer from this when NOTHING will make it go away...hence the reason I'm still away from last night. Good luck. There really is a lot of information there.