As trite as it may sound, try to be thankful for every day and not panic about the possible future. None of us, good or bad genes has a guarantee of a tomorrow. I have a friend who has better than normal genes, who is now in a powered wheel chair because of a car accident. And his attitude toward life is truly an inspiration. He still blesses and attacks every day with a "make the best of what you have" attitude. And being one myself who leans toward the "worry about tomorrow", depression side of life. I really take inspiration from his example. So look around, you have it so much better than many. Try to take comfort from that.