On and Off but regular headache. Need relief!!

I need help!! I have a fairly consistent sleep schedule and wake up around the same time every morning. For the last week, as soon as I wake up and climb out of bed I have a throbbing headache right towards the center of the back of my head. It comes and goes throughout the day and then returns in full force before I go to bed that night. I've been drinking tons of water and I'm trying to avoid taking any prescriptions or OTC's. Anyone have any tips for relief?