I got hit by a soccer ball in the head. I did not pass out or anything I just got a headache afterwards that has now gone after 2 days. Will I be okay, I have no bad symptoms or should I got to the doctors?

A 2 day headache is a bad thing. You may have suffered from a mild concussion.  Watch for signs of dizzyness, confusion, forgetfulness, nausea, shaking, and vision problems. There has been a link found between head injuries and a later in life dementia. Be careful out there.