When you sit for an extended period of time, whether it is for work or you are driving or watching tv, you need to wake up your pelvis, re-orient your eyes, and move your neck and spine. It's like pieces of a puzzle. If you want to feel better, you have to be willing to make changes.
You may be holding your breath, furrowing your forehead, tensing your jaw, squeezing your shoulders. These are unconscious un-necessary movements. Honor your needs, and pay attention to what feels good in your body. You may benefit from doing The Feldenkrais Method®.