Not to be a dick, but it sounds like you actually just drank a can of placebo. Sugar intake isn't correlated with increased heart rate or inattentiveness in healthy people. The myth of the sugar rush can likely be attributed to confirmation bias [1], and you probably just extrapolated this onto your current experience.

Of course, you could just have undiagnosed diabetes too.

[1] http://www.yalescientific.org/2010/09/mythbusters-does-sugar...