Hello, my father who is 83 years old has been suffering since around August/September with painful calves and feet. It really hurt to walk on his feet (felt like walking on golf ball) he said. Also, he had some slight numbness in his left hand. However, over the months, he has gotten progressively worse. He cannot stand on his feet now, his right hand is now numb and is unable to hold a glass or pencil or anything for that matter. I ve also noticed that his cognition is declining. He is starting to forgetting words to say and becomes a bit disoriented to time. He also says things nonsensical at times. This has changed quite rapidly in the last month. We are worried and at our wits end. Any possibilities we should be paying attention to? Please help