my son had a suddenly blackout while waiting for a train and he was brought to the hospital and treated for wounds on his forehead and his ears from the fall and i dont know what else the doctor gave, since i was only talking to him on the phone. the next morning, he said to me that he had  entire headache..i want to know, what can you say about it. is his fall has a bad effect on his head?
You must consult your doctor and do ct scan head as there might be central subdural bleeding causing the headaches it is necssarybecause if you give any machine it might react so final drag is needed for giving medicines for further management