It's so strange that the first vet said "I don't know what's wrong." It just seems that @catwoman707 and I both came to the same conclusion without even seeing the cat, but hearing the description of what the vet saw on x-ray and what the lab tests showed, that it looked a lot like HCM. I can understand her saying "There's nothing I can do," because there was nothing more she could do except tell you what it MIGHT be and send you off to a cardiologist to get a cardiogram and see if there's enough heart muscle to work with so that medications might help. I'm surprised she didn't even suggest HCM, but maybe she didn't have enough experience to think of HCM as a possibility. Every vet I know that hears a heart murmur is quick to send the client for an echocardiogram. HCM is not common, but it's not uncommon either. The symptoms signs you described are pretty classic. In any case, when you do get a firm diagnosis, whatever it is, you might want to send her a copy, just for her own education, because it might help someone else's cat in the future. Most of us on TCS have our knowledge because of past experiences, so sometimes that may give us an edge in putting two and two together. And vets are humans too, and not all of them grduated near the top of their class. I know several locally that I would not go to for any reason. I'd rather drive a couple of hours to one of the vet schools near me with anything really complicated, but we're lucky here. We have two good vet schools within reach, Georgia and Alabama.
I hope you are able to get your cat in very quickly, both for his sake and for yours. I'm really sorry that you and Swarley are going through this.
I hope you are able to get your cat in very quickly, both for his sake and for yours. I'm really sorry that you and Swarley are going through this.