Dear Christine, Welcome to HCM, I understand your concern. Theoretically speaking you should not experience any low sugars with metformin as it only makes your body more receptive to insulin. But practically speaking on many occasions when the mild sugar elevation is purely due to insulin resistance the symptoms of hypo may appear. Your description is classical as your symptoms appear after Dancing/ household work. please get a glucometer and test your blood sugars when you have these symptoms. At any point of time if your blood sugar is less than 80mg/dl you can be sure that you are having hypoglycemic symptoms. Please continue to take valsartan. Hope i have answered your query. Please do get back if you have any further queries Dr.Riyaz Sheriff, India.