I suffered with chronic daily headache for many years.  I was told that it was psychological, and I guess that there is some truth in this because any pain is made worse by stress.   There is a link between concussion and headache – and in my case every time I have had a concussion I have experienced headache, so I don’t know how much concussion has made me vulnerable to headache. However, what really helped me was following the Low Tyramine Diet and avoiding working directly under fluorescent lighting. I still get headaches but much, much less frequently. When I first suffered with headaches they were more like tension headaches, but now they have evolved more into classic migraines, however if I avoid too much tyramine, looking at fluorescent lighting and disrupted sleep, I can be pretty much free of them.