Is is possible to be allergic to blue cheese?

I just nearly puked after eating it. I made a salad with different meats cheeses and egg, I don't normally have blue cheese but it was in the fridge so I added it. I took one bite of my salad and after I swallowed my stomach immediately felt nauseous. I was like wtf! so I went and double-checked all the dates on everything I had in my salad and they're all good. I started picking through the salad trying to eat each thing separately to figure out what turned my stomach, and I learned the hard way that it was the blue cheese! Just putting it in my mouth made my mouth water and gag and my stomach was preparing for rejection lol, I had to immediately spit it out and immediately rince my mouth out from the faucet lol! It ruined my salad, and my stomach is still sour. Is this an allergic reaction?