Hi rmv65, After 3 endoscopies and prescriptions drugs, I had had enough, especially when the GI after my last endoscopy told me to never take a PPI again as the cells in my intestines were hypertrophic. So...I knew I needed to make a change. After following a young man with a 10 year journey and no one able to find what was causing his symptoms he switched to functional medicine. So I had nothing to lose and I switched to a functional medicine doctor who tested me thoroughly for causes, looked at all my vitamin and mineral levels, thyroid function, etc. In addition to SIBO, I had SIFO, an overgrowth of clostridia which is a bacteria, mold exposure, low in B2, low in zinc. I was put on a prebiotic and probiotic to build up the good bacteria in the gut (all antibiotics kill the bad but the good too), a number of natural remedies that require the doctor's recommendation from specific companies, worked with her nutritionist to eliminate what I shouldn't be eating and include some things I should - Kefir and other fermented foods (pickles, sauerkraut, kombucha, yogurts that contain active cultures - I eat only sheep's milk for easier digestion). As well buy only organic fruits and vegetables as much as you can afford. Low Fodmap is too one size fits all - so I ate the foods that agreed with me even if they were on the list as the nutritionist suggested. My functional medicine doctor is in California and only treats patients in the state. But you can seek one out at ifm.org by city and state. Each has a bio and their specialties.
My doctor also recommended infrared sauna and epsom salt baths that help eliminate toxins.
Best to you. I know it's not an easy path.