I had SIBO a few years ago caused by antibiotics according to my doctor because they not only kill the bad bacteria but the good bacteria as well in your upper GI tract. I was put on a prebiotic followed by a probiotic to build back the gut microbiome. With the help of a nutritionist my doctor had on staff, she guided me with changes to be made in my diet. I omitted sugar as bacteria love to feed on sugar and used stevia instead for a sweetener, omitted dairy and switched to sheep and goat milk products like yogurt and cheeses as those are easier to digest, switched to nut milks instead of using any dairy products for adding to coffee or other drinks, eating or cooking and omitted gluten products as I tested positive for gluten intolerance (gluten destroyed my gut lining). There are plenty of gluten free breads, etc.
It takes commitment to these changes to get to feeling better again and it also takes commitment to continue with these dietary changes. But it worked for me tremendously!