If your metformin was to coutneract insulin resistance caused by the hormonal fluctuations etc. which then caused your blood sugar to rise then I'd be looking to both reduce insulin which causes you to hypo unless you increase your food intake to match it, and cut the metformin unless there is some other purpose for taking it? e.g. you are type 1 and insulin resistant/have PCOS for example.
Not a medical opition though so if you do reduce your insulin, be conservative. Stopping metformin will not stop hypos if your insulin dose/carb intake remains the same.