@charliegirl that my problems - since I was 12 - was do to an intolerance to lactose! I haven't gotten a single cavity since I gave up lactose finding through this horrible process. I did a DNA test. My gums were in bad shape, and I always had cavities! The lactose and SIBO RUINED my intestines! It took 5 years to heal them. I suffered from malabsorption problems because of it. Anemia and vitamin deficiencies. The biggest thing was that I could no longer digest INULIN (garlic, onions, and more) nor insoluble fiber (think celery strings). I used to get stomach issues from the time I was a teen. It was horrible! All of that stopped. Ironically, they put chemicals in the "Gas-X" which made my stomach aches WORSE! The bloat from the trapped gas sent me to the hospital TWICE with paramedics suspecting a heart attack! It was simply trapped gas pain. I couldn't expel it. I can't digest anything ending in "-ol" like mannitol. (Oligosaccharides. So a scrap of paper fell out of my folder where I had written FODMAP and I couldn't remember why. The doctor said it was a diet and I should look it up. I did and it solved my problems. It took 3 years to figure it all out but it solved the abdominal pain.
Periodically, the SIBO returns, and I take a targeted antibiotic called Xifaxin. I only need to take a couple, and I'm good to go. Once we receive a diagnosis of IBS, we must change our diets so our bodies heal. It's free - don't follow Dr. Gundry or any of those profiteers. Go to the original university-designed program. I went to all these hoighty-toighty integrated doctors and they made the pain worse! This totally fixed it. I had relief in the first 48 hours after years of struggling! You start out thinking it's going to be tough if you are a foodie, but it was a welcome change to narrow the wide variety in my diet. I found substitutes for EVERYTHING and I am healthier for it: https://www.monashfodmap.com/