I'm sorry this is happening to you and your kitty. There is only one thing I can think of to suggest and it is due to his needing his bladder expressed. Do you have someone who could check on you to be sure you get home every night and are not in an accident and in the hospital? Your kitty won't be able to wait to be found, or for you to come to and call some one. It's a dreadful thought, but one that you need to consider. How we cross over is important.