Hi Mema,
After reading your post it reminded me of what happened, one time, to me during my first year post surgery for AN. As I lay on my back and just before falling off to sleep I suddenly had the feeling I was being pulled backwards. The feeling was so strong, much like centrifugal force. Very disconcerting! I never have had that again, but I do have the centifugal force feelings while I am awake and moving around. These cause me to side step, sway, or stumble due to the removal of my balance nerve and also SSD along with nystagmus of the eyes. Mind you this does not stop me from carrying on with day-to-day activities, although I do not have the stamina I used to have as my balance issues tire me out around late afternoon. I hope you find some answers here, if not and they continue a call to your doctor or another might be warranted if not just to ease your mind.