I left my post open ended on purpose for "creative interpretation" or something like that. I probably should have added:
"An extreme example of excessive pressure on eyeballs... eyeball squishing for short." 
Clearly an example of psychological trauma, especially given that it lasts to this very day. Dumfounded as I was, I didn't have it in me to challenge it.
I thought about what it must be like. Billions of tiny little lights floating around like a herd of cats trying to avoid collisions. Long lines for the next available physical body to occupy. Tiny little light skirmishes and things like that.
I love your term "map of subterranean realities" - the best way I ever heard it put... my inner dwelling places! Things I probably shouldn't admit to here, like my inseparable invisible friend! Poor guy's been with me since I was a child but he made a horrible mistake when he took on that pompous, controlling and harshly judgmental fake identity during my cult years.
The difference is my/our enhanced post-cult ability to (hopefully) see fantasies and wholly fabricated, dubious mental constructs for what they are.
