I did not have removal of the ileocecal valve. But I have SIBO, being treated with Paleozyme digestive enzymes after several bites of food and Dr. Shade's No.9 bitters, 10 minutes before eating , L-Glutamine first thing in the morning, Enteragram twice daily with or without food, and probiotics. With the guidance of a nutritionist, I only eat fruit low in fructose which include all the berries, do not use sugar but do use organic Stevia for my coffee and with plain yogurt, drink raw Kefir because it's fermented and eat other fermented foods such as pickles from the refrigerated section of the market, gluten free breads, pasta and crackers and chips. Bacteria that are in the small intestine have come from the lower intestine to feed and they feed on sugars. Drastically reducing sugars in the diet gets these bacteria back into the lower digestive tract where they belong from my understanding.
Hope this is helpful to you. All the best.