My 13 son was hit by a much bigger running kid and fell really hard backwards. His head literally bounced off the floor. He had a concussion. This was over 3 months ago and he has since been experiencing chronic migraines to the point of throwing up about twice a week. The last two weeks he is getting daily sometime more than once daily nosebleeds that take at least 20 minutes to stop.they say ct scan is normal but could there be something very wrong