Agoraphobia

Is starting to sound like a nice way to escape. I'm writing a short story about an agoraphobic. I am trying to understand the madness from the point of view of someone unaware that they ARE mad...Do you ever wonder what it must be like to be completely incapable of dealing with the outside world because you have so much fear of what could be out there waiting for you? What triggers these things? I think my character will have repressed issues from a stress-induces situation. possibly a rape, or an accident, or witnessing something terrible happen to someone else that she couldn't prevent. That part of the story will probably be an underlying current, referred to but never explained. Her window is literally the door into her nightmares...Since she never slept enough to have real nightmares. Fear, anxiety, the rush of adrenaline...the world outside is one never ending horror film, the kind you can't help but watch even though you KNOW something terrible is about to happen. Its a sick hobby, watching the world without interacting. Sick and fascinating.