Gideon first started having an upset stomach in 2023, aged two and a half. It took us until late 2024 to get him to see a specialist, who wasn't able to spot anything, and we were left baffled, but with medicine (Mebeverine) which helped a lot. And so things carried on with that making his life okay for the last two years.
About 3 weeks ago his stomach started getting worse. He was completely attached to the microwaveable fuzzy giraffe that he clutched to his stomach, he was crying intermittently from pain, and it was clear that we were going to have to go back to the doctor. We'd made a half-hearted attempt at an exclusion diet when he was 3, but excluding food from the diet of a very picky 3-year-old is...not easy. But at age 6 he was capable of understanding what we were doing, and once we explained a couple of times he was entirely on-board with us trying a week without milk and then a week without wheat, to see if we could at least exclude the most common foods before we went back to a specialist.
4 days without milk did nothing to fix things. But I did notice that Gideon was regularly feeling just fine before dinner, and then rubbish afterwards (highlighted by me getting him to score his pain out of ten several times a day) And, as his evening meal is universally fish-fingers, potato waffles, and beans, and as wheat sets off my IBS, I decided one night to substitute his fish fingers for my gluten-free fish fingers. Which, again, made no difference.
Somewhat baffled, but with all of the obvious options excluded, I switched his beans out for peas the next night. And he felt fine. His stomach was rated a "9.5" at bedtime. So I did some research and discovered that baked beans are a prime source of galacto-oligosaccharides - part of the O in FODMAPs (which I am very aware of because of my own IBS), and a common source of food intolerance.
It's now been a week since then, and 4 days since he has had his stomach medicine (which was previously thrice daily) and he's been fine. I am relieved, delighted, and ashamed for not having worked it out years ago. I've let his school know that they should stop with his lunchtime dose, and we'll see how it goes.
One interesting point along the way - when trying a milk-exclusionary diet at home we tried him on almond milk in his cereal, and his lips got all puffy and he felt all weird. So we've dropped that very quickly, and at some point over the next few weeks I'll take him to the GP and ask for advice on allergic reactions to nuts.