Hello, I am Insulin Resistant too!
Saw my endocrinologist last wednesday and he did prescribe Metformin 2000mg daily. I am just beginning and have to start with 500mg and slowly increase the dosage as it causes severe GI issues. He also suggested a diet lower in carbs and of course higher protein and veggies.
He did not promote any one in particular however South Beach is very close to what he is wanting me to do. He also wants me to do daily exercise.
Good Luck, in the past it was very difficult for me to lose so I know how you are feeling.
Suzy