Relax, that's what you're supposed to do.
good thing that i'm not the only one that thought so.
as for the thread poster (or anyone else who is interested) if you are reading this far down, here's a few tips to avoid a bad trip:
Just try and remain clam and focused. your thoughts are going to wander and there's nothing you can do about it, but try to concentrate and keep reminding yourself where you are at and what is happening if you should find yourself losing touch with reality.
Open up a window and get some fresh air. Don't go for a walk or a drive, it will not help in anyway, it's a very bad idea.
Drink plenty or water and eat some food, it will help you stay more level and feel better.
That's really about it, I wouldn't recommend trying to take any other drugs to counteract or cause a different effect, and going to sleep isn't really the best thing especially if you are alone because you are going to have crazy dreams and if you wake up and you are still high, it's going to be fucked up. but if you have to, then go for it, it could be better to not be awake and hopefully you'll be over it when you come to.
oh yeah, and just having the right mindset really helps. You gotta be positive and in a comfortable place before you start.