A lot of your questions are valid and unfortunately, a lot of them do not have answers. IBS itself is difficult to know - whether it will always be around, whether you'll always need medications to control symptoms, whether it may come back when presented with a trigger - and I think PI-IBS is similar in this. Studies have been varied, but I seem to recall one where patients said they were still symptomatic with IBS up to 10 years out from their initial infection. Granted, I don't know if this study clarified how the subjects were defining their IBS. For instance, I still consider myself to have IBS, but my symptoms are under control for the majority of the time.It's my understanding that when the body is presented with anything that may alter the bacteria in the GI tract can lead to problems. So if you get an infection or take antibiotics or have bacterial overgrowth in your small intestine, your symptoms could potentially increase. This goes for people who do not currently have IBS as well - It's possible that certain individuals have the potential to develop IBS and infection is the thing that throws them over the edge. Out of curiousity, did your IBS develop after an infection?