Within the condition of the Pre-Traumatic Stress Disorder (Pre TSD) , the stress is the outcome of a phantasmic event, an imaginary episode set in the future; an event that has never taken place. Unlike the PTSD (Post Traumatic Stress Disorder) in which stress comes as the direct reaction to an event that (may) have taken place in the past, within the state of Pre-TSD, the stress is clearly the outcome of a potential event. Within the Pre-TSD, an illusion pre-empts reality and the condition in which the fantasy of terror is focussed is itself becoming grave reality. If it is taken to extremes, even an agenda of total war against the rest of the world is not an unthinkable reaction.
One may wonder at this stage whether Pre-TSD is just another name for paranoia. I would argue that the difference between the two is rather obvious. In the case of paranoia he who is subject to the disease makes us feel sorry for him. In the case of confrontation with a Pre-TSD case, we happen to feel sorry for ourselves.
(Pre-Traumatic Stress Disorder-A Glimpse Into Israeli Collective Psychosis by Gilad Atzmon, http://www.gilad.co.uk/)
And here is one possible illustrative interpretation of David's anxiety burst: