I can relate. I heard early on when I first started smoking that you can start getting scary, paranoid trips down the road. The first time I got one was my first knife hit experience and fell on the floor and saw Hell. In hind-sight it's funny as sh*t. But at the time I was totally trippin' balls.

Since then when I've gotten high I can feel when the dark-trip starts to creep in. I shake it from my mind and tell myself it would be a waste of money if I let the bad-trip take up most of the effect. When that doesn't work, I take a break for a while. Works like a charm =]