I've known several adults diagnosed with Type II diabetes. Some have managed, even after being initially placed on insulin or medication, to control their condition through diet alone; after they've been diagnosed and prescribed insulin or medication. The Diabetic diet leads to weight loss, and increasing physical activity can help as well. So, my first advice would be to faithfully stick to the diet and increase exercise, because there may be a chance to eliminate the need for insulin and/or medication.
I've also known people who weren't able to do the above, and who eventually had any number of the resulting medical conditions. This is why the above advice is as important as it is (even if insulin and or medication cannot be eliminated after initially using them to control the condition).