<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing back pain, ringing in my ear, double vision and headache after I got hit on the head last week, what could be wrong with me?  <response>: Based on your symptoms, it seems that you have suffered a head injury or a concussion. It is important that we do a thorough check-up to assess the severity and extent of the injury. 