you know I think I figured it out after talking with a friend. With the amount of caffiene I drank I think that my heart was probobly beating really really fast, and since you know when your high you sometimes feel things a lot more sensativly than normal (i'm like this at least) I was concentrating on feeling the blood pump through my body, and it became painful to me. This pain killed my high (which as I mentioned was amazing but lasted only about 20 minutes). I think I need to take it easy on the energy drinks.