Everyone in this tale has a rock-solid hamartia: hers, that she is so sick; yours, that you are so well. Were she better or you sicker, then the stars would not be so terribly crossed, but it is the nature of stars to cross, and never was Shakespeare more wrong than when he had Cassius, "The fault, dear Brutus, is not in our stars, but in ourselves.
We live in a universe devoted to the creation, and eradication, of awareness. Augustus Waters did not die after a lengthy battle with cancer. He died after a lengthy battle with human consciousness, a victim - as you will be - of the universe's need to make and unmake all that is possible.