Meditation and a headache

I've often found it hard to push past the pain of a headache in order to meditate. Other pains do not hinder a session of meditation as much as the pain of a headache does. Perhaps because my focus is on my breath or mantra chanting, or the visions that dance before my inner sight, which all tend to be located (at least I experience them phenomenologically as such) in the vicinity of the head. Today seems to be no different. I stayed up much too late watching the Oliver Stone film "The Doors", but had to get up early this morning. I am paying the price today.