My major symptom was excessive gas, but I don’t remember it as foul-smelling. I never know what a J-pouches means by “diarrhea,” but I don’t recall having any of the three key symptoms (watery stools, urgency, frequency) except as clearly caused by gas (I went more often, but mainly to relieve the gas). If I had foul-smelling, watery stools I’d be very careful to rule out C. diff.
The treatment worked, and the SIBO did not return.