Sounds like tension and/or sinus headache. I'd recommend getting some benadryl or claritin that has a decongestant in it (for the real decongestant - ie pseudophed - you'll have to ask behind the counter for it). For tension headaches, I'd recommend going ahead and finding some excedrin for it -- something about acetominophen plus caffeine really helps kick those (or take a tylenol with a cup of soda) while ibuprofen family won't generally touch it. You can then try to take a really hot shower to see if you can get things to relax at all.

BTW, for a difference, tension headaches generally feel like there's a really tight band around you head that won't quit and can also come with fun blood pressure poundy pain too. Sinus headaches, generally, if you push where your head hurts the pain will relieve incrementally for a short time while you are pushing (don't ask me why, but it's true).