I completely relate to yiur balance issues. I progressively got worse over 8 years to the point I have motion lights all over the house and used walking sticks outside for stability. Doctors just made speculations until my physiotherapist noticed my eyes did not seem to track correctly. I went to a visual therapy clinic that had all the correct testing tools and found the lacunar infarcts had caused a vestibular-ocular signaling mismatch that caused my dizziness, balance issues and headache. I was prescribed a 3 x/ day mu upsilon eyeglasses and at home light therapy exercises plus tinted prism lens glasses. It was life changing! Instead of feeling hopeless and 20 years older, I now feel 20 years younger. This was totally missed by several neuroligists. Might be worth checking into. Good luck.