Thanks for the responses!

Guyomech, as far as my bad experience is concerned, what I found hardest to handle was that it wasn't some darker counterpart to the wholly other rapturous states and visions which had accompanied my experiences in the past. Rather it was a state of intense paranoia, emanating not from the chemical change but from within myself. I was in a state of hyper-awareness of the environment and could see the influences of the decisions I made. In the actions of people I knew to be my friends a great distrust arose; human intention was assigned to anything and everything. A quieter voice recognized this to be what was happening, and while powerless to stop it from occurring, provided enough consolation to quietly wait it out.

I have a more detailed write up for both this experience and the subsequent coming to terms with it which I intend to post sometime soon.

Looking back (and thinking about any future occurances), I'm not so sure if 'just waiting it out' is a good response to these experiences as it attempts to merely keep everything in a stasis of sorts. Does anyone have any other methods or approaches when dealing with the inevitable bad trip?