What the hell happened?

So i smoke every now and then, but last night I was with a group of friends and they told me to take the first hit out of the bong so I did and i don't know how long I was blacked out for but when I finally could see, everything was in slow motion and i was shaking and my head felt really hot and I was so thirsty. I felt like I was dreaming and it Wasent real, all my friends seemed normal though