Symptoms 2 weeks after a head injury in which you remained conscious does not indicate a serious brain injury..........in the vast majority of cases.
Headaches even weeks after a head injury may indicate intracranial bleeding, but your description does not fit into that group.
After saying that it is difficult to be precise about the cause except to reiterate my comments in the paragraph preceding this one.
I presume that you have taken an analgesic in an attempt to relieve the pain and if it did so, then that would certainly make an intracranial bleed even more less likely.
Keep us informed.