At 71, I have similiar issues with balance and fatigue. I steadily increase the use of my cane. It appears my body is slowly wearing out which is a long way from where I was in the younger days. I blame this on Agent Orange exposure during RVN time but, but and but. I can drive but exercise is almost impossible except from a couch. Laying down is immensely more comfortable while walking becomes increasingly diffcult within minutes. Good Luck