Hi, I am a female, 58 years old. I am taking Metformin 500 mg once a day. I feel sick I have nausea and stomach pain, also very thirsty. I though that I had something very salty to eat but the thirst wont go away. I have a headache as well. Also my face turn red more than usual. Yesterday my back was hurting in places than never bother me before.I took the last pill today around 2 PM. How long would it take for the medicine to leave my system if a stop taking it. I don t have diabetes only that the levels were borderline and the doctor decided to give it to me . My father had diabetes. I have been taking it for a month more or less. I take a multivitamin, Omega 3, Vitamin D, CQ 10 and magnesium every day. Should I worry about this or just stop taking it and see.