Mystery puke???????????????

Yesterday something odd happened. I was having dinner and was having pizza and an italian sub. For some strange reason after I ate the sub, I felt sick to my stomach. So i went into the bathroom and tried to do some breathing, trying to make myself not puke. However, I did. Then after that I felt fine. I even ate some more pizza and some cookies. Felt fine the rest of the day. The sub didn't taste weird or anything, and it happened so fast I don't think it was food poisoning. I've gotten subs from this place countless times. Any ideas?