I had a bad trip that started as getting stuck in a thought loop, but that wasn’t so bad. It devolved into paranoia, and temporary loss of language interpretation - I could barely articulate simple thoughts, and could barely understand simple english. I also lost the ability to forward plan and forgot what my daily routine was. To top it off, I had excessive paranoia and the other effects made me very scared. Simply put, it was terrifying. I thought my life was over.

Edit: a word.