That drs comment on blinking was very odd...

[ Has your handwriting suddenly gotten much smaller than in it was in the past? ... blank stare or do not blink your eyes very often, you should ask your doctor about Parkinson's disease.
10 Early Warning Signs of Parkinson's Disease
http://www.parkinson.org/understandi...-warning-signs

My dad will say he feel quivery inside when his pills wear off.
His first issues were one leg not moving as well and not being able to flip food over on the barbecue.. turning the wrist over action was very limited.

Did you have xrays or spine MRIs after the accident, to check for spinal injuries?