Curious if you ever found out what this was and if it has improved over the years. I am currently 2 months post op TDS and I am experiencing the burning now. Found out some foods were the culprit, but even on a more bland diet I am experiencing burning when going. I swore I had hemorrhoids, possibly fissures, but went to my primary care doc and she examined outer and inner and said no hemorrhoids and no fissures. All I can surmise is that with our new plumbing, the food goes down one way, all of the acids and bile through the other limb, and the acids/bile are full strength once they hit the food at the common channel and mix with the food for the 3 feet or so of the common channel before entering the large intestines/colon. Sucralose ferments in the colon, but I rarely ingest anything with that in it. I think I need to dial back my fats intake as a next step. Lidocaine is my friend for now, but looking for insight if it improves with time and/or what you found helped. Thank you!!