Mitchell,

There is research and information about these events. The research shows that people who have a history of depression, anxiety, and OCD or have lived traumatic and stressful lives live with brain's that are easily triggered into inflammation, even without physiological cause. The emotional/psychological trigger sets off these inflammatory responses that cause the same symptoms as a true impacting concussion.

Dr Atkins did some of the research for the VA. UPMC has similar research.