Gluten free replacement breads/cakes still tend to be high fodmap/inflammatory.
Ok, this is just me, but Celery causes massive flare up of gut pain, including a special “poker up the arse” stabbing pain
took a while to work that one out.
Nightshades (potato, especially the skins, tomato, peppers, aubergine), cause a lot of people gut pain and reflux (some need to avoid them all, but many people are ok if they limit the amount and frequency they eat these things, some are fine with some nightshades but not others).
Grains- all of them, not great for many people with gut problems due to the type of fibre they contain, and the gluten, phytic acid and a whole host of other things they contain.
I’ve had great success (for years), with a Paleo/primal diet. Marksdailyapple is a great (free) site, it has a searchable archive and a lot of info on exclusion diets, gut issues and all the other reasons why people change to this diet, which is based around leafy greens, non starchy veg, nuts, seeds, meats, fish, eggs (and dairy too if you can tolerate it). No grains, so no gluten, and the emphasis is on fresh, unprocessed food.
Worth a wee look and a month or two trial IMO!