I'm not diabetic but I second the recommendation by UnclePen,
This is a journey that you're going to have to figure out however I'll share some of what I've learned from reading in trying to figure out my path to weight loss and health.
From my understanding of the disease a diabetic (Type 2) is someone whose body becomes so insulin resistant that their pancreas cannot produce enough insulin to lower the levels of sugar in the blood, which is toxic. The amount of insulin is unable to do its job of directing blood sugar out of the blood stream. Since insulin is unable to do its job properly weight loss is often one of the first signs of Type 2 Diabetes.
So doctors prescribe insulin injections to increase the amount of insulin in the blood beyond what the body can produce to help clear sugar from the blood.
Insulin is our fat storage hormone (it actually turns off fat burning and turns on fat storage). From the book Why We Get Fat
Gary Taubes notes that a large majority of diabetics who are prescribed insulin injections start to gain weight rapidly due to the excess insulin being sent into the body.
This is why it can be impossible for a diabetic to lose weight eating a 'well balanced' meal with ‘healthy whole grains’ and then taking an insulin injection to counter the blood sugar spike.
I follow a lot of low carb happenings and one of the people often mentioned with regards to diabetics is Dr. Bernstein, who has an interesting life story as a type 1 diabetic and who switched his life focus from engineering to medicine because none of his doctors were giving him good advice. It is often recommended to diabetics to follow his diet plan outlined in his book Dr. Bernstein's Diabetes Solution
He is very much against a lot of the mainstream advice given to diabetics and you can see a short debate with him here: http://www.youtube.com/watch?v=3PZno7Nkuuw
You have nothing to lose to at least consider new advice and if you do decide to pursue an alternative treatment such as this make sure you have a fully supportive doctor, there are lots out there. And read, read, read!
"Eat as if your life depends on it!"