sometimes headaches are caused by dehydration. I've been able to help a headache by drinking a couple glasses of water in a short period of time. becareful with the diuretics. While caffeine is a known headache remedy, it may cause more dehydration and worsen the headache later on...IF it is water related that is.
The pepsi will also raise your blood sugar. So if it's a low blood sugar problem, the caffeine AND sugar will get you fixed up pretty quick
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