Is there some reason why you are immediately suspecting the Metformin
though? I am just curious because when I was diagnosed with PCOS
some seven or eight (give or take) years ago I was put on metformin as well. I experienced severe nausea as well as vomitting, diarreah, upset stomach, etc., etc., etc. but this was something that I experience as soon as the metformin was in my system. As soon as I stopped taking it, it went away.