Headache caused from dehydration?

Lately i have been getting some really bad headaches. I am 21 yrs old, and up until this year have never had a serious headache, and now it seems like i'm getting them all the time(2-3 times a week). at first all it took was letting my hair out of my pony tail, but that's not enough anymore, I do think one cause could be lack of water, I didn't drink much today, so i have chugged a few gles. Will this even help? is there something else i can do? I can't swallow pills and chewing a pain reliever is so gross, i only do it if i feel like i'm about to die. it's getting close to that point. Any suggestions for finding some relief would be so helpful!