Thanks, unfortunately, he has never had his glucose level checked before, so I have no way of knowing if this is something that is just typical for him, or something new. Several years ago, I noticed he was lethargic when only eating once a day. There weren't any seizures, but he just seemed hungry and would sometimes vomit bile. I immediately started feeding him twice a day and he was totally fine.
Today, he is definitely back to his old self. I am finishing up a course of dewormer and a course of antibiotics; the vet really thought that this was all just due to an infection somewhere or a parasite. He is so much back to his old self, that I have to agree with the vet. The vet did recommend, though, that we return in a couple of weeks for them to test his blood sugar again once he is really back to normal. If it is still low, they will do the test that can tell if it is an insulinoma. However, even if that's what it is, if he is not symptomatic, I would probably opt to just keep him on frequent feeds. From what I've been reading, the surgery is not always successful and can be filled with complications. I also have strong reservations about putting him through something so traumatic.
I am just very glad right now that he is doing so much better and is back to his usual, ornery (and somewhat misbehaving) self
