Thanks for posting on HCM,
You see to have got a mild head injury
and with the symptoms you seem to present it is normal them to occur a few days after you had the trauma. You will only have to take some pain killers like acetamenophen or aspirin
to alleviate the headache and pains. That should be taken for about 5-7 days and after which if you still present with the same symptoms, I suggest you get a CT scan
done to rule out any severe intracranial eventualities.
Hope this helps