Metformin is for diabetes; my husband takes it. As far as I'm aware, it's never given him any problems, but then he's practically normal anyways. Since it's going to be impossible for you to control your blood sugar through diet--as there are so many things you can't eat (or have to eat) for your gut, that's probably the way to go. Although I hear that 30 minutes of exercise a day is supposed to do wonders on the blood sugar. If you could afford to get yourself a treadmill and worked on getting in 30 minutes of walking on it a day, that might be enough to help your blood sugar. Cinnamon has also been shown to lower blood sugar; my husband noticed a drop of about 10 points when he started putting it in his coffee every morning. Obviously you can't do coffee, but maybe you can make cinnamon toast? I think you're supposed to do 1/4 teaspoon a day to get benefits. Red pepper and other hot spices are also good for diabetes as well, but obviously you can't do those either.