Tension headaches. I woke up with it, tried to sleep it off a couple times, finally got up, took an Advil, put some Bio-Freeze on, took a shower, took another Advil, and have had one cup of coffee (about to have a second). It's still here, but it's more of a general ache if I turn my head too fast. Hopefully it's in the process of going away.
Still not nearly as bad as a migraine, though.