AFIK there is only one report that whey protein can help stabilise blood sugar levels and that was written not by a doctor or researcher, but by a journalist, who also happens to write for several health publications that (just by coincidence!!!) happen to carry a lot of advertising for protein supplement products. Draw your own conclusions!
What will bring your blood sugar levels right down is a combination of the meds you have been prescribed, plus a radical reduction in your carbohydrate intake. Carbs convert 100% to glucose, so the more carbs you eat then the higher your blood sugar will be. Reduce the carbs and you will see your blood sugar levels reduce to a healthy level.