sounds like the tension headaches i get. ten days is a pretty long stretch, i'd put in a call to a doctor.
Are you under more stress then normal? I know when I get extremely stressed my eye starts twitching like crazy. It also happens when I get lack of sleep. Maybe try taking a day off just to rest and be calm and if by the end of the day your not feeling even slightly better call your doc and make an appoinment. There could be underline issues. Good luck.
I suggest you see your MD and get a Cat-scan!