Matt2584 wrote a post "Walking Stick" that got a lot of comments from people with poor balance. I know that a BI can cause balance problems that may not respond to the things that helped me (someone without a BI) but I thought I would share them just in case. Five years ago I noticed that at a relatively young age, my balance was deteriorating. I was already too likely to end upon the ground by twisting my weak ankles; I really did not need to add balance problems to the mix. Then sciatica and back pain emerged and became my bigger problem. Yoga did not help. Chiropracty did not help. Cortisone shots did not help. I did physical therapy. Now, 3 years later I am pain free and have much better balance.
I my case, it turned out that my hips had gotten misaligned over the years of non-stop sitting at desks, airplanes and meeting rooms. Daily gentle exercises for hip alignment from my PT and the first half of this restorative yoga video ( youtube.com/watch?v=mKVunWM... made the difference. It was not immediate. It took about a year, but as I mentioned, the pain is gone. The balance issues seem to have come from the misalignment (the chiropractor found that i was carrying 1.5 stone more of my weight over one foot vs the other.) Interestingly, I also regained a lot of lost flexibility that had apparently also been blocked by the bad alignment.
As I noted above, this will not cure balance issues stemming from BI, but if you have been sedentary like me, this gentle exercise approach may address part of your balance problem. In any case, the increased flexibility feels great! I hope this helps someone.