When I had counselling sessions for my depression I used to walk out of the room and would have depersonalisation for the next few days at least. And I often couldn't remember what had gone on in the session properly, it was all hazy and I had only a vague idea of what happened. But that's all. I imagine everyone feels like that.

As for it being triggered on purpose, I wouldn't enjoy that. I hope your permission was asked for first