It's moderately terrifying that you've identified how it feels to have something so whackadoo happen to your brain, and from what I can gather, without it having happened to you?
Like, I get this. Non anomalously and different, but, "I'm not the person normally in here, I'm the same person but I'm a different her, and when she comes back I'll be stuck again" kind of weird-ass stress induced dissociation/derealization/whatever and just, even WITHOUT worrying about "the other one's" intent or possible collusion, it's still terrifying. Even in your own bed, not a cage, it's terrifying.
Anyways they could stand to be more scared. Maybe one of the failures can be more scared and have a part to play.
Because heck yeah, I agree, if you're looking for someone to experience this without being *fully incapacitated by it* that's gonna be rare. Because it literally is the knowledge that you will disappear for an unknown amount of time, or possibly die but nobody notices and you keep on going but with a fully different consciousness inside you and nobody EVER notices unless you tell them. Nobody. Not a parent, not a best friend, not even a spouse, can tell you from them when this happens, because there's no difference other than the sense that you've just started to exist and weren't existing earlier.