wow Lara you have a great memory...11 years ago.....

I also lose my balance in low and no light conditions. I have very numb feet and have a reduced proprioception, so i am using my eyes to balance. I am starting to get increased imbalance, even in well lite conditions, if i am looking anywhere but straight ahead while walking, up, down, back, to the side i start to drift.

Maybe even the degree of numbness you have is affecting your proprioception, and/or your vertigo