Low acid can certainly contribute to SIBO, which can cause the problems! PPI’s will just make it worse. It can’t hurt to try the diet, very strictly for a couple of weeks, to see if it helps. Also, take slippery elm lozenges and DGL to help with the pain, and start drinking real bone broth as recommended by the GAPS diet and Weston Price. If the problem is SIBO, the probiotics can make it worse.
I had asked my G.I. doc’s to test for low stomach acid, but they refused, and don’t have the equipment for it.