I'm sure Kurt had shizophrenia, altho I'm not entirely sure they said it in the story. These are the things I remember:
+ Kurt had a jonger brother, who was jealous because Burt spent more attention to Kurt
+Blaine was in the story too, he was in the hospital because he had surgery for his legs (he had something wrong with them) and that's where he and Kurt met (Kurt was just released from the mental ward)
+ Kurt had like these 'visions' and he called them number 7 (this was the good one) and then another one who was the bad one
+Puck and Mercedes appeared in some chapters too, they were the ones who could calm Kurt down now and then.
SO I really hope someone knows which one I'm talking about, because I really, really want it back :(
thanks in advance!