The medical term used by your doctor is likely to be Cerebral Concussion. In simple language this means that the brain was shaken up sharply during the accident. The abnormality is transient and corrects itself. The immediate and long-term outlook is good. The other likelihood is Contusion. Here, the brain is bruised. This takes longer to correct itself and some symptoms may persist for as long as three to six weeks. I suggest you wait till the scan findings are available. These will make the abnormality in the brain - if any - clearer. Your doctor will then guide you about further treatment.