Oh ok, it just kind of turned on a sudden in the Journal entry sections. I can understand much of the difficulty in overcoming PTSD. I don't have it, but I am bipolar so I have cyclical depression that I deal with; and I have acute times when I am easily overwhelmed and have trouble dealing with the outside world.
What I tend to do is envision myself in a bubble with surface as strong as steel, and I keep adding layer-upon-layer, until I start to calm down. It sometimes works.