Apostacious
Bluelighter
For me, it was an extremely high dose of 5meo-dipt, which lead to an extremely painful and confusing trip. Needless to say, the way I saw reality at the time, was quite terrifying and fragmented. It was very exhilirating at first, but when my heart rate was dangerously high, fluttering, and at times stopping for a very short time, I had to get to the E.R., in order to have my heart rate slowed down and evened out. All I needed was a benzodiazepine. I learned from the experience, and was scripted clonazepam shortly afterwards. 
