I have personally experienced both spectrums with my psychedelic experiences. One positive experience involved me sitting on a hill near a road only to get los

I have personally experienced both spectrums with my psychedelic experiences. One positive experience involved me sitting on a hill near a road only to get lost in a the almost musical sound of cars whooshing by. Afterwards I returned to my apartment and experienced amazing closed eye visuals of some kind of fused technological/organic robots trees. The onset was seeing the walls of my apartment melt before my very eyes. One negative experience involved me pacing back and forth furiously in my apartment for hours while crying hysterically. If felt as if the weight of everything (good or bad) humanity has done and would do in the future was crushing me. I think tripping alone may have added to this experience.