I can recommend WorkRave (en.wikipedia.org/wiki/Workrave) to "enforce" screen/keyboard breaks. I also use a vertical mouse which I find gives a better position to my wrist/hand when mousing.
If it keeps happening then see a doctor, I've had surgery on both hands to fix carpal tunnel and trigger finger issues caused by too much keyboard time without taking breaks.
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I can recommend WorkRave (en.wikipedia.org/wiki/Workrave) to "enforce" screen/keyboard breaks. I also use a vertical mouse which I find gives a better position to my wrist/hand when mousing.
If it keeps happening then see a doctor, I've had surgery on both hands to fix carpal tunnel and trigger finger issues caused by too much keyboard time without taking breaks.