Hi. I Am Allan 85 Years Old. Recently I Have

hi. i am allan 85 years old. recently i have noticed a weakness and lack of feeling in my left hand. i became aware if it when i was using the ? machinee at my club. Has been going on for several weeks, i think. also think right leg is losing balance, stumbling. any ides? Some signs of alzheimers but dont believe this is related. allan thanks