@chas123 From my experience I agree with your plan to ask about vasovagal syncope and to consult a gastroenterologist. My milder fainting episodes were about five years ago which resulted a vasovagal syncope diagnosis, my going on proton inhibitors and all seemed okay. Then after a severe bout of GI symptoms last year I consulted a gastroenterologist, stopped the PIs and (after scans and tests) and was diagnosed with mild pancreatic endocrine insufficiency. Your comment about poor digestion may be a clue. My GI symptoms have not recurred.