I was hit in the head at a boxing match and started to get a mild headache about 30 minutes after, lasting about 2 weeks (only symptom). it has cleared now and i've started fighting again. could this be a concussion? and have i gone back too soon?

Losing brain cells: To stay on the safe side, avoid over-using the brain after such a concussion. That means don't study too vigorously, don't play video games, don't spend time worrying about things, but basically let the brain rest. Also, a person who had a concussion should avoid getting a second concussion. It's not wise to keep losing brain cells. Some sports destroy brain cells.