Hi, I understand your concern and I'll try to help you. The trauma that you reported does not suggest gravity, especially because it occurred months ago.
However, it is important that you and your family are aware of the warning signs for intracranial complications after
head trauma. These signs are excessive
drowsiness, persistent headache, change in behavior, confusion, nausea and recurrent vomiting.
It is likely that the headache you are suffering is unrelated to the trauma and should be disposed of the most common causes of headache, such as
tension headache and
migraine.
So if any warning signs or if the headache continues messing up your life, I suggest that you look for a good
neurologist for further investigation.
Hope I have answered your question. If you have any further questions I will be happy to help you. Wish you good health.