I remember back about ten years ago, I was a reasonably healthy person. I had the odd cold, got the annual flu bug and had some mild allergies, but other than that, I was as healthy as a horse. That is why it struck me as very odd when the headaches started coming. Aside from the times when I had a sinus cold, I never had headaches and now they were coming very frequently.
I made an appointment to see my family physician and he then referred me to a neurologist, as we could not pinpoint what the problem may be. By the time I got in to see the neurologist, I was also having fainting spells and was getting very sensitive to light.
After numerous questions, he pinpointed the problem. I had just recently started using a computer all day at work. I had, what he called, electrosensitivity. What this is, is a super sensitive reaction to an electronic device. In my case, it was the computer. I stopped using the computer for a couple of weeks and the problems disappeared. I now do all that I can without the computer and just log in at the end of the day to input data and check emails. I have some bad days, but I am mostly headache free.