OP here again. Just got back from my dr visit, armed with questions from HN. Doc is open to investigating Celiac, so he took some blood for that. He's going to recommend me to a gastroenterologist who may pursue an endoscopy/biopsy. I'm tempted to start avoiding wheat now, to see if it has any positive effect. But doc also told me to not do that until after seeing the gastro, as it will affect any test he may do.