"Heavy" feeling on the heart roughly 10h after (a bit exessive) Energy-Drink drinking?

Well the cause is obviously the energydrinks. I drank a litre in a timespan of 6 hours followed by 2 hours of no drinking activity followed by 8 hours of sleep.
This morning i got this feeling of a certain amount of preassure on the heart-region of the chest. My sternum but more inside (where my heart is, duh).
Any clues why this happens?
Could it be because my body "longs" for the heightened effect of attention? Or could it be that my heart is a bit tired after the prolonged effect of the mixture of taurine, sugar and caffeine which leads to an increase of heart rate?
"Heavy" feeling on the heart roughly 10h after (a bit exessive) Energy-Drink drinking?
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