after we moved in together my wife started having pain in her neck and getting frozen, where she couldn't turn her head very far to either side. this coincided with her starting to use a big armchair that i inherited as a primary desk, sitting with her body facing forward and the laptop balanced on the left arm of the chair. once she changed her position in the chair so that she is facing the arm with her legs tucked under, the neck pain went away.
also, i get tension headaches from time to time, which are referred pain from my upper back when i'm stressed out by something. i don't notice the extra tension in my back but it is obviously there, i end up with big knots. moving my shoulders, thoracic spine, and neck through their full range of motion - carefully, as in through feldenkrais - helps a lot. e.g.,
https://nickellson.com.au/2020/04/06/feldenkrais-shoulder-spine-integrator/.
point is, sounds like it might be good to find a different position for your racing game, and spend some time moving your shoulders deliberately.