question: FOR ABOUT TWO YEARS, I HAVE BEEN GRADUALLY LOSING STRENGTH IN MY LEGS UNTIL NOW I AM BARELY ABLE TO WALK. ABOUT TWO MONTHS AGO, MY LEFT ARM DEVELOPED TREMORS. WHAT IS THIS? I AM 80 YEARS OLD AND BEING TREATED FOR BLADDER CANCER, PLUS ARTHRITIS IN MY NECK AND SHOULDERS. THANKS, JESSE