It might have been a migraine or motion sickness
Quote:
Motion sickness or kinetosis, also known as travel sickness, is a condition in which a disagreement exists between visually perceived movement and the vestibular system's sense of movement.
Maybe it's too real, so your body feels like it should be moving and then it doesn't?
Sorry that happened, hope whatever it was doesn't happen again
I haven't had that issue with Skyrim at least, but I had to get a mod to stop the camera from spinning so fast around the char when AFK (and some mods to make it less grey and boring, but that's not as relevant)