Every 15 minutes or so, focus on an object at lest 20 feet away. Imagine a huge box around you. Rotate your eyes to each corner of the box at least three times in one direction, then reverse the direction. Rub your hands together as if to warm them, then place the cup of your hands over your closed eyes. Hold them there for one minute for a good rest.
Simple movement can help prevent repetitive stress injuries.
Periodically bend or stretch your thumbs, move your wrists in a circle or dangle your hands and shake them until the tension is gone. Every 15 minutes or so, look up into the distance. Your eyes will get a chance to rest. You'll be giving your mind a chance to refocus too, and that might just help when you return to work. You'll find everything you need with ADT protection.