Ok so, im a doctor actually (not bragging) and i know for a fact this is a real problem and it can really get to be a true health issue. Carpal Tunnel syndrome is a thing, and so are other entities like it, it happens mostly to people who work for long hours on a desktop PC because of the way we tend to rest all our weight on both or one forearms. Its a good idea to try to be aware of this and correct it, having a correct posture while sitting infront of a PC, not leaning too much on the desk, if pain is already here i would suggest submerging both hands in a bucket filled with warm water (be careful, you dont need it to be VERY HOT, just enough for relief) for about 15 mins 3 times a day for at least a week, also consider using a soft hand splint or a bandage. If pain is being overhelming i would suggest some rest from the intense gaming and trying some NSAIDs (naproxene, paracetamol, etc) Hope this information is of use.