Weed is a psychoactive drug. You can trip off of it. Often, a person may feel a little "drunk" on a trip, especially if they had been drinking. A person can also make themselves nausious. It's happened to everyone at least once. Don't worry too much about it, sit back and try to let it wear off....if it's too bad, try to fall asleep or pass out and sleep it off is the easiest.