Miserable tension headaches. I use excedrine and ibuprofen together to make them stop. or, well, to lessen them. The best way to use medicine with these headaches is right away, as soon as you can. If you let it go on for a few hours before doing so, your reactions to the pain will probably make it hurt worse, and be much harder to stop later.
Ive also found long shower to work well. anything to keep my head tilted slightly up while standing, and the warm water is nice too. Im sure like many of us, you spend a lot of time with your head at a slightly awkward angle to look at the screens of various electronics. That doesnt cause the headaches, but it sure doesnt help them either.