What happen to me today?

I was craving for the most delicious chocolate drink in campus center for few days and finally I got one. Sedap sangat-sangat. The consequence after that i got so dizzy, my eyes could not even open. Why?Why everytime I drink chocolate or coffee from outside i became like that. I checked on the internet, there are people who allergic to dairy drinks. So unlucky, I love those drinks but I cant have it.