If I have understood properly the facts are as follows:
Minor car accident in Dec
'11, neurological checkup normal, MRI
I suggest that you consult a physician who shall do a thorough examination including examination of the ears and eyes and check for nerve damage
in your left shoulder area. He may guide you to various specialists for clearing any doubts that may arise during the examination. Hopefully nothing serious will come out and with proper guidance you should be on your road to recovery.