Back to answering the actual post, general allergy symptoms, diahrea, constipation, feeling sluggish/tired after meals, bowel pain, headaches, transient joint pain, exhaustion.
Only thing is, those symptoms can be related to many other things. Its hard to know. You can do a elimination diet/trial where you eat only a very few foods and slowly add back in foods which might be an issue one at a time for a week or two to see if symptoms come back.
Its less hard to do than it seemed a few months ago. I don't eat commercial food hardly at all. There are gluten free products, but I won't lie, mostly they taste not so good and probably aren't that good for you anyway. The tricky items are the sauces and hidden forms of wheat like dextrose or 'flavoring' or even msg can be made from wheat. Soy sauce is wheat and soy. Tamari can be wheat free. There are online stores with gluten free products. The rice noodles are ok but the others not so much.
What I eat is fruits, vegetables, grass fed meats, foster farms chicken, some yogurt, coconut milk, coconut oil, olive oil, butter, legumes or potatoes occasionally (I do low carb.) For grains I use buckwheat, quinoa, brown rice (rarely), an occasional gluten free cookie or corn. I make my own eats. If I'm going out I visit the restaurant's website and look for gluten free foods. They are often listed. I also read the websites of major food producers. Salad dressings are not a good scene. Some vinegars are wheat derived but supposedly those are ok.
Sorry for the waaaay long posts.