One thing to remember dude, what happened to you isn't common, most of the time it is just a myth and most people will go through their entire lives without something like this happening. So basically what I am saying, chances are nothing like that will ever EVER happen again.

As far as your story goes, are you even sure it was weed, sounds like you smoked some really nasty shit, like random leaves glued together or some shit, dunno, crazy story