I have the corn allergy, an extremely rare type of allergy, it started appearing when i was 10, and then stayed for a few years and disappeared, then it came back recently, worst of all, corn was one of my favorites.

Edit: forgot to mention what happens when i eat corn, breathing become difficult my (beautiful) face swells, my face turns red, I start shaking, and then i become really really tired.
luckily no puking.