From my experience the burn was associated with too many carbs, or carbs that are harder to digest. Try limiting amount of those. Meat and protein don’t usually give me trouble. I will make ground sirloin patties. I consume potatoes and rice in small quantities now. Gluten may also be an issue as well as lactosr intolerance. Try going off these foods, keep a good diary and slowly reintroduce them to your diet.