It's better to focus on what you can eat, rather than what you can't.
You have choices: you can get advice from diabetesUK or ADA and follow their plan,and see how you get on with it, you could ask your doctor to refer you to a dietician who specialises in diabetes.
then you could do what so many of us on this forum do, which is to eat low carb. A good book to guide you would be "Dr. Bernstein's complete diabetes solution", however the Atkins diet works too or the South Beach Diet. Are you overweight? that needs to be considered too and what medicine you are using, if any. Whatever your choice, you need to learn a bit about it. This forum is a starting point.
You are right that filling up on candy is not a good idea, but 1 square of high cocoa solid chocolate will not hurt you. It depends on which path you choose and how your blood sugar control responds to it. Most fruits are Ok, but they are not essential. You can get all the vitamins and minerals you need from green vegetables.
If your doctor hasn't helped you to get control in 2 years, i would doubt that he knows what he's doing and ask for referal to a specialist or change doctors. My doctor helped me get under control in about 6 weeks.