Please try to calm down and don't be so quick to beat yourself up...you are not "lost" and neither is Corny. Your vet has seen him and sooner or later will get a
stool sample to test, but otherwise she saw nothing wrong. You sound like an excellent snake owner to me, and if I was a snake I'd happily live in your house...
Tell me again, why are you convinced he is ill? I had the impression, perhaps incorrect, that he has refused more meals than perhaps he has?
He's about 5 years old, right? And you've had him for about a year? Maybe his mind is temporarily on mating & he just isn't that hungry for once.
Has he been behaving differently? Hiding more or less? Active more or less?
Your vet will understand that he's not eating & you are still waiting for a stool sample, believe me. Relax...