I would suggest you read up on the special carbohydrate diet and put yourself on the intro diet for three days, and then test the whole thing out for three weeks. It was invented for children with Crohns, but it also helps in patients with IBS, Gerd, Bacterial overgrowth, fungi and parasites (to a small degree).
Experiment a bit and see if honey makes it better or worse, and the yoghurt, etc. It will not give you any diagnose, but it can give you some relief.