I was in a car accident a year ago tomorrow. I'm still getting headaches and when I get tired some of the initial cognitive problems return (i.e. mixing up words in sentences). Still, even right after my accident the doctor told me to go back to work (I write reports and the mixing up words thing didn't work too well with that). I almost wished I had more noticeable physical damage so that they would take me seriously. Again, same as you, the CAT scan came back fine. Anyone have any idea how long this will last or if I can count on it being permanent?