I mean, it sounds like you just got dehydrated and maybe a little contact high.
Nothing all too dramatic to go so far as to say you are having trouble showing emotions.
Drink more water next time. Bring some water with you, too.
If you drink, have a few drinks beforehand maybe. Depends on if you are the type to get really tired, really quickly when your buzz wears off or not.
And, lastly, don't worry so much about what anyone else thinks about it. Even if that person is a girl you're trying to impress. You do you, man.