I have been trying to figure out a way to handle insanity in my campaign (converted Game of Thrones). I was stuck to a degree, I have the Gamemaster Companion for RMSS and it handles mental illness as a disease, I have Cyberspace and have some ideas from the CRS stat. But they don't really give the flavor I was wanting. For instance, I don't want a character to go into screaming psychosis over getting cut. But I would like for them to perhaps develop claustrophobia when they are buried in a collapsing building for 10 hours.
I just bought several Spacemaster Datanets and was going through them. I really liked the new radiation rules. Then it occurred to me that in a lot of ways insanity is a lot like radiation exposure. People have so much they can handle before snapping, but there are lots of little cracks that will show in the facade along the way. The idea that psychotherapy, (or in an old world campaign, hacking down the guy that caused you grief) would mitigate some of the accumulated effects (lowering the REM) appeals to me.
I have read that there are insanity rules in Nightmares of Mine, but this is one of the few sourcebooks I don't have. Without stepping on anyone's copyright toes could someone give me a rough idea of how it is handled there?