HEADACHES!!! HELP PLEASE!

Da
So all though put my life I never really got head aches. When I did they didn't hurt really at all and they only lasted at max ten minutes. The worst ones I got were on my period but even then they didn't bother me. 
Right now I have a head ache and normally I don't take anything but I took an Advil this time. I've had it for over 2 1/2 hours and it still won't go away. I work out and eat only healthy things. I've been eating some fruit mostly. That makes me feel good normally. I drank 1 gallon of water already today and anything I do won't make it go away. I tried sleeping and everything. 
What can I do that could help? I need advice since I don't get them almost ever. 
Just so you know I am sexuality active but the last time anything happened was Oct.1 and I got my regular period on the 21st. 
I work the same as always. College isn't stressing me out at all. Nothing in my schedule has changed at all. 
Please help me ladies, it would be greatly appreciated.