First, just to confirm, you probably are having some swelling enlargement of you colon...the splanic flexure (where your colon turns from traveling across your abdomen head down toward the rectum) to be precise. Or at least that makes sense with you getting full very quickly...it extends up pretty high on the left side, and could compress your stomach somewhat.
I also, just as a cautionary word, want to comment on IBS. IBS really isn't a very specific diagnosis. It's mainly just sort of a catchall for a set of symptoms that could have many different causes. Colonoscopy is really the only way to rule a number of different causes and come up with a more concrete reason for the symptoms you experience. Given the invasivness of it, if you can get the symptoms under control, it's just a lot easier to deal with the illness that way. So it's okay that you haven't had a colonoscopy.
But getting back to my point: your IBS may be very different than someone elses IBS. Dependent on whether you have diarhea prone, or constipation prone types of the syndrome (or others), the foods that set you off vary. In this case, I would imagine that it's okay to experiment with food and see what helps and what doesn't. If getting rid of some things helps, then cut them out for a while and slowly return them later on if they are things you can't live without.
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