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If this sweating is occurring episodically, then it would be appropriate to be concerned about hypoglycemia, or low blood sugar. Sweating is one of the common symptoms that can occur with hypoglycemia. As a medicine for diabetes, metformin typically does not cause hypoglycemia, but in someone that is using metformin for a reason other than diabetes that is having sweating that appears to be related to the dose of the metformin, it would be appropriate to check to see if this is the cause.
Diagnosis would require checking the blood sugar when the symptoms are at their worst, as the blood sugar is usually normal between episodes. And since this usually does not happen when you are at a doctor's office, this would usually involve using a home blood sugar monitor.
If it is not occurring episodically, then it would be appropriate to be concerned that it is a side effect to the drug. Certainly, sweating is not one of the common or typical side effects that are seen with metformin, but it has been reported. If the sweating started after starting the metformin and the severity correlates with the metformin dose, then it is likely that you are one of the persons that develop this uncommon side effect.
If I can provide any additional information, please let me know.