Is it possible that the joint was laced with something? It could also be that the alcohol and weed had a bigger effect than you realized until you tried moving around. I would suggest not doing it. I stopped after years of smoking because I discovered my source was lacing so they could make more money. (These were people I was raised with and they never said anything to me about it) Best wishes, Sissie
That same exact thing happened to my little brother ( I am not a smoker or a drinker at all ) but my brother smoked that k2 & that also happened to him.
Must have been a big hit because I think you were just high. Don't worry. Just don't do it anymore :)