It didn't have anything to do with people making out on your bed did it? Just think back to any minor or major details that would have triggered what happened. Have you had panic attacks before?
I guess just hope it doesnt happen again, go somewhere totally chill and smoke up. It could all be in your head, might be good to take a tokage break for a little bit, or not as smoke as much just till you understand what actually happened.

Take it easy