Talk to Gastroenterologist on Gestational Diabetes

I am 34w preg with my 2nd.Diagnosed gestational diabetes. Attaching report. My doc advised me glucophage 500mg twice a day bcz of some prb in my ultrasound report.Problem is, i am having cold sweats and drowning feel after having 1st dose of glucophage. Kindly tell me is it any side effet of something else?