The problem was that my farrier, who is really just a trimmer, had already looked at his hoof and didn't come up with anything, but as I had suspected and is now confirmed he's really not the right man for the job. I was in the process of trying to find a new farrier, when I decided to call the vet because I was starting to worry. Anyway, what's done is done, and at the very least the whole experience has pushed me to find a proper farrier. Boy if I could redo my career choice I'd go into the farrier business!
The hardest thing about riding is the ground.