One issue I'm trying to overcome is some magical thinking (in a nutshell, magical thinking is the idea that just because you think about something, it will happen) : two of my cats have died in recent years after going to the vet. And while yes, both needed to go to the vet, in both cases I think actions by the vet precipitated problems that might not have occurred if I'd stayed home. In one case this is probably OCD thinking, the other isn't, the cat really was overtreated.
ANYWAY, my remaining cat hasn't been to the vet in 5 years. He's super healthy (I think), but he should probably go.
Compounding this, is knowing two single women who were both diagnosed with cancer within a couple of months of having their last cat die. So I'm like, No, Max, you cannot die!!!! Making taking him to the vet seem even scarier.
Yes, magical thinking, all. But it's very strong. I don't have too many issues that are purely magical thinking. My germ fears are at least based in some sense of reality. But I find the "magical" types of fears much harder to deal with.