Hi there and welcome to the forum John
Stomach problems (diahrrea, wind etc) are a well-known side effect of Metformin, but usually not so much with the extended release Glucophage. I wouldn’t rule it out though. I would suggest either talking to your Dr or doing as you say, stopping the Glucophage for a period to see if things improve, but do take care to monitor your BGs meantime. A low carb diet should certainly help.