Blue continues to recover; he is now eating as much food as I'll give him and having normal bowel movements. (if still a bit loose...) Also, he will actually drink his antibiotics if I mix them with something he likes, so I don't have to sluice the 8cc's into his mouth twice a day. He's still on the metronidazole, for now, and I'm also giving him probiotics twice a day.
The prostate swelling seems to be completely gone but the vets say he needs to be on antibiotics for at least 2 weeks, so that's the plan for now. I'm happy to report that he is acting just like his old self.
I don't know how to post pictures here but I may figure it out eventually...