<s>[INST] i hit head first wakeboarding 3 days ago, I was shaking for about ten minutes afterwards but then seemed fine the rest of the day. however as of yesterday I have a terrible headache,and feel very nautious. I am very sensitive to light and sound. what should I do? [/INST] Thank you for your question.The symptoms you describe sound most likely like what is referred to as post-concussive syndrome.  After a concussion the area takes time to heal like a bruise on any other part of your body.  Migraine-type headaches are not uncommon.  We typically see these symptoms resolve in less than a week; if it goes on any longer, gets worse, or you develop new symptoms seek medical attention to rule out any significant injury.  In the mean time, we recommend rest, staying hydrated, and an over-the-counter pain reliever. </s>