Hello,
we cannot recommend medication changes online. These instructions need to come from your doctor.
However, it is common practice to increase medication dose to help control blood sugar (the maximum dose of metformin is about 2500 mg/day, in split doses). Some people do take their medication before eating. Please discuss changes in medication dosing with your md.
You may also find that restricting carbs (eat more fat, non-starchy vegetables instead to replace the calories) may help in reducing your blood sugar.
Some exercise / a brisk walk after eating may also help in lowering blood sugars.