Sounds like a food sensitivity. You can have them to any food, and to very specific foods (like one kind of meat and not another). I was having rashes, hives, joint pain, brain fog, slurred speech, vestibular difficulties, sound processing difficulties, stomach pain, irritability, bloating, you name it. I found a functional medicine clinic and cried and begged them to test me and sure enough I have 72 food sensitivities, as well as sensitivities to household molds, medicine, and functional foods that I had been using all the time.

Symptoms of food sensitivities, which are a different biological response than allergies, can be weird and vague and can seem unrelated to food because they aren't intestinal symptoms always.