I think I'm allergic to Penicillin. When I was 3 years old my mom had an allergic reaction to Penicillin and apparently I said I was having the same symptoms, so I've never had Penicillin to this day...over 30 years later.
I am also sensitive to citrus fruits and juices. It makes sores in my mouth. Weird, I know.
I've never had an official allergy test in my life, so there are probably a million other things I am allergic to but just don't know it.
I think I just discoverd I might be allergic to Hyacinth flowers. I got some for my birthday and just about died in the car on my way home.