Am I having an allergic reaction?

I usually stick with basic non-processed foods like fruits and salad and eggs, etc. I never have soy, peanuts, tree nuts, and hardly eat gluten. (I knowwww it's weird but I just like to eat what I like :)) Anyways, I had a quaker oats breakfast cookie and 3 hours later broke out in hives, a fever, nausea and vomiting, and a swollen, tingly tongue. The same exact thing happened a month ago when I had some cheerios. It feels excruciating. Allergic reaction or just a flu bug? If it is allergies, the ingredient as to what it could be is beyond me. I've never had reactions like this before! Also, did not take any medication either time.