Hypoxia and Medicine

What is a medical condition that makes someone allergic to almost everything?

I'm trying to write a book and the main character is based off of myself. I don't have this medical condition but i think that the condition would be perfect. I got the inspiration from Hannah Moskowitz's novel Break. The main characters brother has this condition.

Public Comments

1. Wow, I totally wrote that book. Sweet.
2. she really is hannah moskowitz. Honest. Break was freaking awesome.
3. One condition that can make a person react to almost everything is systemic mastocytosis.