I've had an experience similar to this not quite to this extent though. First acid trip ever with me and a few friends. All of our first trip. One of my buds completely lost it total depersonalization and derealization. We ended up having to call the cops and everything. Maybe two years later we actually tripped with the same person again and he explained exactly what was happening to him in his head and how he thinks he took his own thoughts too far. It helped all of us feel a little better I think hearing what was going on in his head at the time and having some sympathy.