I haven't tried that, but the vast majority of my headaches have clear other causes-- Most of them are linked to the start of my period and happen a day or two before that starts. I'm irregular, so that's often the first indication I get that a period is coming. They're the reason that I tend to take anaprox first when I get a headache.

I get some headaches from lack of sleep. This was much worse when I took oral contraceptives. When I was on the pill, getting even a little less than eight hours of solid sleep meant a headache that no medication would touch.

I get some headaches with sinus trouble or from eating certain foods (mainly eggs).

And then there are the anxiety/stress headaches that are always provoked by specific things going on in my life. In the case of Wednesday's headache, anxiety is pretty clearly the cause.

I also generally only get 2-3 headaches a month.