I've experienced the same situation with a family member. He woke up one morning and while he was getting dressed, he couldn't tie his necktie. He'd tied his necktie every day for 20+ years. But he said as he stood there in the mirror that morning, he couldn't make his hands tie the tie. One week later, diagnosed with stage 5 brain cancer. Three agonizing months later, and I mean agonizing, a good man was dead.
It's a cliche, but enjoy every day you have. Life is short.