Mimi, cut down the carbs (sugar, white flower, rice, potatoes, bread, everything). Eat lot's of fresh salads, lean meat, fish, lot's of fish. No fruit either. You will start losing weight and your blood sugar will be fine, but you have to be disciplined. Depending how much weight you need to lose this initial phase might take 2 weeks or a couple of months. Use some good quality olive oil and don't be afraid to add it to your salad. Get rid of any processed food. Cheese is good too. Feta, mozzarella, swish cheese, whatever you like but it has to be low carb.
However, if you go to your old habits you'll gain everything back. You'll need to keep your carbs intake down. You can have pasta for a lunch (afther the diet), but during the evening hours, a peace of lean meat/fish and salad or some steamed/cooked vegetables. You can treat yourself once a week and eat whatever you want, again after the diet but that's it.
Trust me, I have friends and family members who did this and their blood sugar is perfectly fine now. They also lost weight and feel good.