good morning, I found this to be really interesting subject. Towards the end of a very stressful 10 year career as a filmmaker, film producer/production manager, is when I started experiencing my symptoms, very subtly at first. there were times when I was so stressed out, I would be come short of breath and my stomach would churn. 80-100 hours a week working. in addition to this in 1982 I suffered a minor head injury (a concussion) through a very violent confrontation with a former best friend/roommate. (stressful physically and emotionally). anyways I 've changed my life and now live in the Caribbean, not without it's stresses.but considerably more relaxed. unfortunately, the pd has already manifested itself. I found it interesting that it was so closely related to the stress and trauma theory. regards Lisa