Hey Mitch, we all will face that inevitable day, it sounds like your becoming depressed. And with your health at this time that's understandable. But the time left isn't written in stone and dwelling on it isn't helping you any. It sounds like you are very limited in what you can do. Is there any hobbies or something interesting you might be able to do? Stay active here, be involved in the topics, maybe start a daily diary here adding funny stories from your life, your thoughts etc.
Remembering the good times the funny times lifts the spirit. My grandfather lived to 97, his brother 103, his sister took her first airplane ride at age 102. Never give up. I hope you feel better soon.