Hmmm...sounds like you just got really good weed and weren't prepared for it.

If you didn't have any existance bending thoughts or visuals so that sort've rules out PCP

And if it was laced with coke....you'd know.
There would be alot of white powder all over it.

But getting buds and not shake is the best way to go..I'd just try it again in a chill place when you're in a comfortable.

...or mail it to me lol.