For your work, do you work a lot with computers? If yes, you
need to take a break in between. After one year of torturing my
eyes, I begin to experience symptoms like yours.
See doc - doc says need to rest the eyes more often. It's
getting strained, thus the headaches.
See optician - optician says eyesight is stable, but like what
doc says, is getting strained. Need to rest.
Anyway, if it continues despite resting it, better to see a doc
and your optician.
Aye, i do face the comp a lot.. curse of the technology age...
soon the whole of SG would be blessed with huge number of myopia
students... 
watching sumthing 
Like what?? 