Strange but for me whenever I do exercises, I am left very weak. My legs give out and am very weak. No matter how often I perform or repeat the exercise. Everybody (doctors, PT, OT, etc) says "you need to exercise" but it seems ONLY in my case it does not work. So do your exercises!
From my diary, I noticed every "cloudy" day makes my balance worst.
Good luck and may God bless.