I am glad that the vet has put Socks onto special food. You may find that once the infection is cleared up the diabetes will not be as serious and you might be able to control it through diet and exercise. Infections stress the body and animals (or humans) who have diabetes tend to have a flair up if they are fighting an infection. In the mean time make sure that he is getting plenty of water so he doesn't become dehydrated.

Our paws and fingers are crossed that you will be able to get by with the diet and exercise