I would definitely suggest that you consult with an optometrist and/or opthalmologist. I am an optician and in a case like this, I think it would definitely be advisable to consult with a professional for help, if you have not already done so. Sometimes, as maximus indicated, pain like that described can be attributed to eyestrain, especially when sitting in front of a computer, reading, or watching television for long periods of time. In addition, it could be also related to just headaches if the pain is not acute.
In loser_k's case, it sounds like the pain may be indicative of something else entirely. Definitely consult with someone as soon as you can.