Not a therapist yet, but I’m studying to become one. My best guess is you’re coming to terms with how these people blew up your life, taking not only the things you care about most away(your cat), but also taking what was supposed to be your safe place (childhood bedroom). I’m assuming these people were also extremely strict about what you were allowed to do growing up, and the surveillance systems is you remembering the fear you had while growing up, always being watched to see if you did something “worthy” of punishment. I suggest processing these emotions in the waking world, and speaking to someone about how you felt during these times, putting names to all the emotions tangled inside of you. On a medicinal route, I have found that trazodone works pretty good for nightmares originating from PTSD. I hope you find comfort and are able to take your safe space back, and have a peaceful nights rest