I've seen like a lot of things happen, but now im stuck

I found the curse-detector or whatever it's called, I took it to the dark room, I put the girl plushie on the chair, it teleported me somewhere, then I destroyed the chair, got attacked by a black model and now I can't find my curse detector anywhere, the doll is gone and Im just running around with a radio, also a hallway just blocked itself off right in front of me, a wall just appeared outta nowhere
I found Ratman, took his radio with portal music, pushed it up against some black thing on a wall, it played some creepy music and now idk what to do
I found a vent and a bunch of drawings in it, it shows that Im supposed to use the curse detector, but again, I lost it

What do i do bruh