I believe I have IBS-D or at least SIBO, perhaps both. I have been to a gastrointestinologist, had a colonoscopy etc. I do not currently get stomach cramps or pain (though I have in the past) and there is no immediate need to run to the bathroom. The most consistent symptom is loose stool. The doctor diagnosed me with IBS.Recently, I was prescribed Xifaxan 600mg (3 [email protected] 200mg) a day for 14 days. The medication either didn't do anything or made my IBS-D worse. Worse only meaning loose stool was extremely loose, completely unformed, diarrhea. Then later I had strep throat (was already off xifaxan) and was prescribed 1750mg amoxicillin (2 [email protected] 875mg) for 10 days. This had the same effecting making the stool very fluid and loose, completely unformed.After I stopped these drugs the stool solidified again slightly, or at least wasn't as loose as it had been when I was on them.I feel this is a confirmation my problem is bacterial based. However I'm not exactly sure what it means or what I should do. I am posting here if someone else can offer advice.