Instituting all of these at the same time can be helpful for stopping a headache just before it gets started. I now suffer from blinding headaches and insomnia as well as numerous other aches and pains. My experience is that post-concussive headaches can be quite difficult, but the blinding headaches sound like migraine headaches. All of the techniques we are talking about can be useful for beginning the process of recovery. I would say that he or she should expect that it will take some time and what they need to do is to become sensitive to what the triggers are and begin to learn how to avoid them, as well as institute a rigorous practice of relaxation.
Physical fitness is important, as well.
If they get headaches for the first time, they do need to be evaluated by their physician. If they have a fever. Or if sometimes upon waking, a severe headache when you don't have a history of headaches is something to pay attention to. Or if they are accompanied by blacking out or dizziness, those are signs that a severe condition may be present. Or if they notice any other symptoms of illness with the sudden onset of headaches.