I would recommend drinking water first. That will help get some water up there (many headaches can be cleared up by water). I also recommend laying down and/or taking a nap. If you want you could even sit down for a small meal with a full glass of water and then take a nap after! Hope this helps!
You can get rid of a headache by wrapping some ice in a washcloth and applying it to your forehead. You can also get rid of it by applying heat to the back of your neck to relieve a tension. You can get more information at the www.ehow.com/how_4487700_get-rid-headache-medication.html website.