5 Hour Energy?
Answers: I tried them on a trip and did not have any of those symptoms (thank goodness).
They are a bit expensive and coffee help just as much.
Looked at the ingredients and can't conjure what caused that spontaneous effect unless they were allergic to something.
The niacin give you the flushed face. Some folks said that's how you know it's working. The fiery emotion in your stomach could be your spontaneous effect to the caffeine or the product as a whole. I wouldn't whip it if it is this uncomfortable for you. I took smaller number than the whole bottle and didn't suffer from these side effects, but I read that some race did.
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