Nice sort of subtle, gradual twist to it. Not entirely sure what is going on, but it raises some interesting questions. Neurotic redneck vampire, maybe?

Oh, just red the tags, so it’s a werewolf. See, the priests bit threw me off, since there isn’t usually as much religiosity to the hunting of werewolves as there is of vampires. So it’s a mentally unstable werewolf, or perhaps just a surly redneck who thinks he is a werewolf?

hahaha! A vampiric hunter on panic attack meds? What could he be afraid of? lol, way to throw that in to get the psychiatrist in there.
I think you should add a Dear Somebody and a Sincerely to make it more of a letter. :)

oops, werewolf!