Pain in eye. Consulted many doctors!

I have consulted many doctors regarding my eye pain but not getting the right treatment. I need to stay for more than 12 hours in front of the computer. I was recommended to use GenTeal gel, 2 times a day and Refresh Ezee as eye drop, 5 times a day. I use Gunnar computer specs which has by default. 25 power. I have +. 5 power. Still I find tremendous pain in my eyes for sometimes from inside. Any solution? Within how many days I have to use the eye drop, since it's a preservative free drop. Can I use rose water, if yes , then how to use it? Earlier I have used .5 Crizal lens but that did not give some positive result. I'm a software engineer and about to pursue my first job.I used to take 3 minutes break after every hour and close my eyes for 10 seconds for every 20 mins. Please give some tips so that I can continue my job successfully. Thanks in advance.