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

あなた can stay in a dark room または cover your eyes for 15 to 20 minutes
also あなた can drink some お茶, 紅茶 if あなた 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 または meditating ..imagine that your are the lotos and clean your aura.

Drink lots of water. Headaches are often caused によって lack of moisture in the brain. または 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 または something like that, I would アドバイス あなた to take an asperin. The effects of asperin kicks in after about 30 minutes. Always works for me. On a 秒 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 あなた have an allergy.

Good luck.