Hey, I know what you're talking about. When I first started smoking bud I had that same feeling: disconnection, reality isn't real, etc. I have something called HPPD, and a symptom of that is something called Derealization or Depersonalization.
Take a look and see if this is your problem. Hang tight man. You'll be just fine. Please PM me if you need some help. I'm still going through this but it isn't as bad. We can go through this together.
http://www.dpselfhelp.com/forum/index.php