Hi You are facing computer vision syndrome which is quite common and increases on constant and prolonged eye work Pl follow following suggestions for relief 1- start with lubricating eyedrops 2 hourly 2- follow rule of 20-20-20 during eye work.After every  20 minutes ,take a 20 seconds break and look 20 feet ahead. 3- adequate sleep  proper food and plenty of fluids 4- exercise/ yoga/ breathing exercises.