H.W.
ETA: if your doc says to get the scan, then do it! :)
First, Chipotle will do it to just about anyone. Did you watch the South Park episode? I wouldn't factor that particular food into your overall health.
I deal with IBS and what's really helped me (like, incredibly helped) is using the FOD-MAPS-friendly diet. Google it. Different foods (fruits, veggies and grains) have different kinds of fermenting sugars which can trigger an IBS attack. I've found that by modifying my diet and making some substitutions, things have been much better. Granted, it requires some creative thinking-- there are few recipes I can follow verbatim-- but my life is so much better.
If you continue to have problems, ask to be referred to a Gastroenterologist. My experience, however, was that they are good at giving you scans (colonoscopy-- which sucks big time) and medicine, but not good at offering dietary advice. At least mine wasn't. If it wasn't for a friend forwarding an NY Times article on FOD-MAPS, I'd likely be suffering still.