I would definitely go to get an exam immediately . You could have a clot form inside your head,could have a bleed inside , or a concussion. So many things. If you vomit that's also a sign of something going on . I mean it's too tricky to know but a doctor would know. My brother had a closed head injury and the day after he went into a coma from a small bleed from a blood vessel that ruptured. They fixed it with surgery but he was in coma for a month.. I am pretty informed on this subject as I lived at the hospital for at least a month learned alot about head injuries his eye had pressure behind it and it was from internal pressure. . Take care hope all is well and I would get checked