I've never heard of that being an allergic reaction before.![]()
You're right, my friend calls it an allergy, but maybe just for the sake of brevity when ordering at a restaurant. I'm thinking it may be classified as an intolerance? If you google it though, you can find cases of people with this condition not being able to stay awake after consuming raw onions. She said it took her the longest time to figure out what was going on, it started when she was pregnant so she thought it was some crazy pregnancy fatigue. But it continued behind that, she somehow linked it to the onions, and read about cases where people could not stay awake after consuming them to the point of falling asleep at the wheel of a car. Food reactions are so varied and strange!
Here's one link: https://answers.yahoo.com/question/index?qid=20090913044748AAcmAcl
