question: I am a 60 year old female, 5'9", 238lbs. They say the part of my brain that controls my balence is shrinking. My balence is bad and my right leg and arm hurts when I stand and walk, when I'm sitting I have no pain, for the last 3 days I am very shakey on the inside and out. What is causeing this? I also have low throid and on meds for this. Thank you Nancy