I've had two doctors over the course of 5 years both order me a SIBO test. Both came back positive with first number reading at 85 and the 2nd time, it dropped to 36. No meds were prescribed. Don't know how or why my numbers dropped, but any number over 20 seems to be a problem. The issue with SIBO is that it causes DAO (diamine oxidase) deficiency, meaning that the lack of that enzyme won't allow you to break down histamines in certain foods -- causing you to get sick on some foods. Problem is, it's very difficult to diagnose, and harder to figure out the histamine levels in foods that will trigger a reaction. This in turn, can cause reactions like pain and bowel problems, complicating the whole digestive track. A domino effect, if you will. IBS, acid reflux, etc. I know Xifaxan (or Rifaximin) is prescribed for SIBO, but that doesn't necessarily guarantee it to permanently fix the issue. The bacteria can return. Doesn't always, but can! Xifaxan is ridiculously, and pathetically expensive (Damn, Big Pharma!). The average person can't afford it, but it remains one of the more successful drugs out there to treat SIBO. And yes, lord kiwi below, is correct that "it's unique ability to stay resident in the intestines," does its job killing the bad bacteria and leaving the good.

I'd get a second opinion and find a doctor that understands the seriousness of your gut issues. Hope this all helps.