SEVERE ALLERGIC REACTIONS BUT NOT ALLERGIC TO ANYTHING!

Hi
I am 17 years old and I've been getting these strange allergic reactions since I was 12.
They almost always happen when I'm on my menstrual cycle and they occur about 1-3 times a year.
First, after eating, I get a stomach discomfort and mild pain that causes me to go to the bathroom.
After, the stomach pains gets 100 times worse where I'm tossing, turning and crying.
I then start to itch and break out in hives. One time, I had to use an Epi-Pen because my breathing wasn't right.
I'm not allergic to anything according to the tests. I've eaten all the foods that have caused an allergy after each reaction and I've been fine. The foods range all the way from peaches to mac and cheese.
I don't know if this is hormonal with my menstrual cycle or if its a problem with my stomach that triggers these allergic reactions. Maybe eosinophilic gastroenteritis?
Any advice?

Thanks
-Angie

[CalGal]

Angie, you may want to check into celiac disease.