Blood sugar levels adjust about every 3 months if you are measuring using the HGb A1C. So you should not expect a drastic change until about 3 months.
Measure your blood sugar in the morning fasting - should be about 70-90. Then 2 hours after lunch or supper should be less than 200. Sometimes the morning sugars are OK but the after meals are spiked.
Metformin is a medication that works very nicely to help the cells open up and use the insulin your body is producing. Most people with insulin resistance needs to take this medication to avoid becoming diabetic.