Does anyone know how to relieve a headache without taking any sort of medication?

You can stay in a dark room or cover your eyes for 15 to 20 minutes
also you can drink some chá if you like

Stop using anything electronical, drink lots of water, lie down in a dark room in complete silence and try not to think. This is what I do and it works :)

Try doing yoga or meditating ..imagine that your are the lotos and clean your aura.

Drink lots of water. Headaches are often caused por lack of moisture in the brain. Or something like that. (derp-level biology)

Lay down for a while. You'd be amazed how much a little rest can help. Opening up a couple of windows helps a great deal to.

But in the end, unless you're allergic or something like that, I would conselhos you to take an asperin. The effects of asperin kicks in after about 30 minutes. Always works for me. On a segundo thought, take in the aspirin right away, and perform the above things I mentioned. That oughta be the best way to get rid of a headache.

Don't worry, medicine isn't that bad. Unless you have an allergy.

Good luck.