Sounds like you just smoked some very dank bud and you were unprepared. Either that, or you are (this is a very rare possiblity indeed) slightly schizophrenic. I know that sounds really wierd, but I know and smoke with a couple of people that are slightly schizo, not enough to make them crazy or even act wierd normally, but just enough to be schizo. When they smoke powerful bud, they usually go through what you decribed, though not quite the same.

Perhaps it was just a powerful and bad trip...