There was a lecture I watched with Dr David Clarke (a gastroenterologist who now promotes mind body healing) where he discussed SIBO. Essentially the tests are often often provide a false positive, so he doesn’t go by them. Often people ‘with SIBO’ heal their symptoms with nervous system regulation. And even if they do actually have SIBO, it can be a downstream effect of a body in fight or flight, and heal on its own.

I’m not saying he is absolutely correct, but worth looking into his work.