If you ever had a bad trip you would know. They are visits to hell prolonged, unrelenting. You cannot will your way out, in fact resisting makes it worse. You cannot surrender to it because of the nature of the experience.
My worst was eight hours of uncontrollable emotions, sadness, fear, frustration delight, curiosity, horror grief, disgust, pride, embarrassment....
Every emotion you can name engulfing you serially, sometimes several at a timetime, cycling randomly for hours.
Imagine the patterns you see on a wall emotions changing and swirling on and on and on.
You know it will be over and you can talk to yourself but you are beyond ego, beyond intellectual ism or rationality.