I've got an issue as well, and I'm going to put it off as long as the cardiologist says it's safe to do so. My prayers are with you as you tackle this issue. One of my wife's best friends is involved in the heart valve space, and she's a genius. What they've done with that technology over the last twenty years is incredible, and the materials they use now are right out of science fiction. Just keep saying to yourself "Everything is going to be fine." Seems to be my mantra these days.
Screw it... I'm going to the brewery.