My Doctor, at the time of my diagnosis, flat out denied the connection between stress and the cause of parkinsons, it became full blown after childbirth. He said that as Parkinson's slowly comes on, an incident like a car accident will worsen symptoms and then people notice the symptoms for the first time. This was true with me. I knew I had it only in retrospect. I can't see getting that to stick in court with what we know presently about the cause of this thing.
Best Regards, redbird