What a relief to come across your posts. My 45 year old husband
had a car accident in Nov, 07. He immediately began to experience headaches, to the point that he had to miss work (which he never does!). Despite my nagging that he go to the doctor (I thought he had whiplash), he attributed his pain to sinuses
. At the beginning of Feb. 08, he had a thunderclap headache with Horner's Syndrome. I took him to the ER, where they proceeded to find - nothing.