Thanks for using HCM, I understand your concern and will try to give you my medical advice, I think you need to take him to the doctor for a medical exam, any trauma in the head is important because can injure internal structures, he already has a headache and you need to pay attention to any new symptoms, if he starts to walk like a drunk, vomiting, increasing the headache or any changes in his habits act fast, remember the brain control the whole body just be alert. I hope that my advice has been helpful