Caffeine withdrawal?

Over 2 weeks ago, i was up all night online drinking pepsi. That monring my heart was pounding. And i was all nervous. I'm 15 and i told my parents about this. They said it was the caffeine in the pepsi. Stayed up during that whole day and went to bed around 7 am. Got up at like 10 pm. After i woke up i was still tired. Is it the caffeine withdrawal causing this? The fatique and mind foggyness, Lightheadedness? I was drinking pepsi so much and NOOOO water at all. I was prob drinking it 4 days in a row without NO water. I went through about 3 liter bottles in about 3 days. I doubt its my sugar. Right now my symptoms are starting to go away. But the other day i started drinking dr pepsi. (had 2 glasses) and it came back again. Erghhhhh hehe any advice?

I'm sorry to say this but your parents are right it was the caffeine. if you don't drink water every once in a while then you'll either get a headache or you'll be lightheaded,it happens to me all the time. your body prob. isn't used that much caffeine in such a short amount of time. also caffeine can cause dehydration so the more pop you drink the more lightheaded you get.

Drink a lot of water over the next two days, and flush out your system.

smart

Try drinking a cup of green tea once or twice a day to help with the caffeine withdrawal symptoms. Because green tea has a milder for of caffeine, and it stays with you longer.

ya, stay off the pepsi for a while.
Pepsi never affected me that way; I was spending $35 or more a month on pepsi and for years, drinking very little water. But you're young and your system may be different. You could be getting too much sugar. If you like pepsi so much why not wean yourself off of it by having a glass of cold water in-between the pepsi.

Here's the thing...if you drink too much liquid then you thin your blood, and it being thin will make you dizzy, lightheaded. Slow down on drinking anything for a while and see if that works.