Here's whats going on. The amount of times you have smoked, means that your tolerance is still in its first stages. You say you got kush, and smoked out of a bong. With your tolerance, a bong, some huge hits, and some dank kush, it's not uncommon at all that something crazy happen like what happened to you.

Next time you get dank nug, don't smoke so much until you are ready to smoke that much. And you should have some pretty good experiences from here on out.