Does this sound like a food allergy?

Whenever I eat a Hershey's Just Add Water, Oil, and Eggs brownie or a Taco Time burrito, I get horrible heart palpitations that will not go away. It happens about 15 minutes after eating them. I have no idea what in these I am allergic to, but I am thinking it is white flour. Is there a way I can test myself to see if I am allergic to white flour? I was thinking of just eating some plain and seeing what happens, but that would be a bit disgusting. Tweet