It's caffeine intoxication. I had it once (from energy drinks). From experience...
- drink plenty of water, caffeine dehydrates you a lot
- whether or not you usually drink alcohol, don't, both caffeine and alcohol increase heart rate
- food might help
- stay away from sodas, many have caffeine even when it's not obvious
- freak out as little as possible, it'll pass
For those who never had it, it's not a big deal but very unpleasant... All the best to you.