Some people's lives seem to flow in a narrative; mine had many stops and starts. That's what trauma does. It interrupts the plot. You can't process it because it doesn't fit with what came before or what comes afterward. A friend of mine, a soldier, put it this way. In most of our lives, most of the time, you have a sense of what is to come. There is a steady narrative, a feeling of "lights, camera, action" when big events are imminent. But trauma isn't like that. It just happens, and then life goes on. No one prepares you for it.
