If you look back up the thread you can see my story re ileoccal valve and SIBO. I have chronic SIBO due to no IV and resection. I have been on Xifaxan every day for 1 1/2 years and my drs plan is for me to stay on it indefinitely. For me, it's been a miracle. No side effects at all. I felt 90% better within the first week I took it, every time I try to wean off it, SIBO comes back. There's no way to keep bacteria out of small intestine with no IV. Good luck. Might be worth trying Xifaxan no matter what the test says. Without an IV, I don't see how you can't have SIBO. But, I'm not a doctor. Not that they know much more about this than us!