Thanks for writing your query.
Headache is a common symptom after head injury
and it takes few days to resolve completely.
Taking pain killer like Ibuprofen
after meals with antacid Omeprazole
20 mg will be helpful in decreasing pain.
You should feel concerned if following appears :-
1. Persistent headache
3. Episode of unconsciousness
4. Episode of seizures
5. Loss of memory
6. Irritability or confusion
7. Difficulty in balance of body
8. Difficulty in vision
If any of the above symptoms appear, please do contact Emergency Department for furthur investigations like scan of your head.
I hope this is helpful to you.