I can't remember which is good and which is bad (red or white wine) but keep in mind the effects of alcohol. Wine is good for the body in moderation. After that peak is met then harm comes to the body, and generally in a small form, but that's not for here.
The reason your doctor may say it's bad is because it's alcohol. And alcohol lowers the blood sugar. Which from reading about you, would actually help you. Numerous studies have shown that 1-2 servings of alcohol a day can lower a person's risk of choronary heart disease in patients with type 2 diabetics. And since heart disease is a huge problem for diabetics, that may be a triple good thing.