I'd be just fine if one of my cats would consistently stay healthy. Poor Henry just goes from one thing to another. Last week, it was an ever-worsening case of chin acne (yes, cats actually get blackheads) that he simply will not leave alone and a limp in one of his hind legs. He's going to be death of me. I worry--sometimes excessively--over every illness and injury, especially when we're scheduled to be out of town.
But you're right; I need to take it a day at a time. My vet was very helpful in reminding me, too, that sometimes there is only so much we can do for our pets. As fatalistic as that sounds, it's good for me to be reminded of it.