To be fair? Your story, totally terrifying as well. One time my brother convinced me to rub poison ivy all over myself so I would get off school. I remember intently searching out all shiny three leaved (leafed?) plants I could find in our wooded backyard. I truly rubbed them everywhere. I had to go to the hospital because my face swelled so much my eyes were nearly shut. They put me on steroids and that was when I finally learned to swallow pills. I think I was in 5th grade. That would be about 9 years old, mabe 10 as it was the end of the school year. That seems less "yes that really happened" than just "this is a crazy fucked up story" though. As I responded to this thread I noticed more of my stories are the latter than what i think the former describes.
Regarding terrifying - I think I find your story so terrifying because my panic response is - for various reasons - to just shut down and become uncomfortably compliant. I will basically do what someone tells me to, even if it's something I really don't want to do. I think you understand why this can be problematic. I try to avoid all and any situations where that could happen and I've been successful/ish so far.
I feel you on the "this is a crazy fucked up story" part. I've had many incidents where I'm like "I'll tell you a funny story" and listeners are like "That's fucked up".