Thinking about the future

Today, while I was working as a cashier at a retail store, I started thinking about some things. These were my thoughts. What is it going to be like if I can no longer work? How do I tell co-workers that I will miss them, especially if in the future, I don't recognize them? How will I deal with the isolation that I'll be feeling? How do I still reach out to people when the words are no longer there? I'm not sure why these thoughts are in my head because right now I'm functioning pretty well. Why am I suddenly worried about the future? I'm not really sure how to answer these questions and I won't really worry about it. Tomorrow is another day!