You may have developed certain intolerances from foods however its hard to know. You should really see your doctor and confirm what is going on. If you developed Crohn's or something like that, your surgery would not have cured it and Crohn's develops mostly in the terminal ileum which sounds like you still have that part. It's better to rule out everything before assuming IBS just to make sure you don't have something more sinister going on. You might want to raise this question in the Healing Well's ostomy forum to see if anyone else has had this problem also. Good luck.
Co-Moderator ~ IBS Forum
Dx: IBS 1989, Diverticulosis 2004, UC 2005, Sjogren's 2006
Meds: Sulfazine EC 1000mg, Mesalamine Enemas, Chlorzoxazone 500mg, Naprosyn 500mg, Symax SL .125mg, Protonix 40mg, Xanax XR 2mg, Miralax 17g, Supplements