[Sadrain]

It's a vegativ nerve system malfunction.
Mostly, it expresses it self as all sort of health problems that cannot be found reason of. Like, suddenly aching heart, it racing, stomach problems, bleeding nose, huge headaches, nausea, and other things. It mostly revolves around something a person fears/is nervous about, in most cases - world outside their comfort zone/house. If they have to leave their house, they suddenly feel dizzy, want to cry, heart rate picks up, they feel sick in stomach, stomach aches... A person could gain that after bullying, experiencing a rape, car crash, stuff like that... Body is simply willing to do anything to prevent it going in the "danger".