That's the mindset of a cancer patient. You live from one scan to the next.
The Bible has some good advice regarding worrying. In Matthew 6:34, Jesus said, "...do not be anxious about tomorrow; for tomorrow will care for itself. Each day has enough trouble of its own." In other words, focus on today. Don't get too uptight about things down the road. They will take care of themselves.
Put another way, as I heard a preacher say, "worrying is assuming responsibility for something God never intended for you to do." Great advice. There's no reason to worry about potential problems. God will handle them. Of course, I should still try to plan for the future. But, for now, as Bobby Ferrin sings in the attached song, I don't need to worry. I just need to be happy.