Hugs to you and baby Nero.
I have to say that I'm so cynical of vets - and I wish that wasn't the case, as I'm sure there lots and lots of really great ones out there.....just haven't run across any!
This summer Alaska and Baggy caught a tummy bug. Alaska was hit harder and went off her food for a few days. I took her for a precautionally visit to the vets who told me that she wasn't dehydrated but they wanted to take some bloods anyway. I went home with Alaska and waited for the results. The vet phoned up and said that he was concerned as there was an increased white blood cell count - OMG!!!!
"But what does that mean?" I panicked, and he explained that her immune system was 'compromised' and that it might have always been this way and that it was something that we would have to live with. He said that they wanted to run further tests for Leukemia and Feline Aids (snap, that's what you got too!). I was terrified, on the verge of tears waiting the results. But an hour later they came back clear - phew, and I asked him what he thought was wrong, "Oh well, it's probably just a stomach bug" he said. "But what about the white blood count and the compromised immune system?" - "Oh, that's nothing to worry about, it will probably come down on it's own". Turns out, Saikou kindly informed me of this, that actually it's perfectly natural that there would be an elevated white blood count because that's what the body does when fighting an infection!
Anyway, drama over, it was just a plain old tummy bug....and a large vet bill!
So my point is, sometimes they have a way of complicating a situation. I don't have a problem with the whole 'it's better to be safe than sorry' approach to testing (within reason), but you do have to wonder how much of that is motivated by genuine concern and how much is motivated by profit.