Feel on the bony ridge above your eyes: About an inch or so from the upper bridge of the nose is a slight depression in the bone. Press FIRMLY with either the sides or tips of your fingers for 60-90 seconds, (the longer, the better). It gets a little uncomfortable. But it will relieve many "tension" headaches. It's worked for me, but not every time. It's worth a try. It's an accupressure point of some sort. I'm not well versed in this practice, but it does seem to work at times.
Also, a vigorous scalp massage seems to aid in blood flow, reducing some headaches, at least for me. Thanks, BlueJay