Very much this.
I've had seven heart attacks.
When I go in with heart attack symptoms, which I've had to do a handful of times (that it turned out not to be a heart attack, I mean) - I don't like going in there and them getting me back quickly. It means things are potentially bad. heh.
I understand that nobody likes waiting, and i've waited before and it sucks. But it sucks less than needing to be taken back quickly, really.