I can’t necessarily give you the best advice, only from the point of view of if you have celiac or gluten allergy, or some other food allergy. But this may not be what you have.
You can try cutting out all gluten, every last bit, from your diet, and see if that clears things up.
If you suspect other foods, you can try cutting them out too.
Or you can reduce your diet to just a few key foods (see “Top 20 Food Allergies with Delayed Reactions” and “Self-Testing for Allergies” and and see if that helps.
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