metformin

Started on Metformin two weeks ago, since then I've felt bloated, really fatigued and I'm sure I've gained water weight or something! I was doing so well with my weight loss from diet and exercise the doctor then said to try metformin... well I'm thinking I should stop taking it as so far I feel awful! Anyone else struggled with these side effects? I feel it's making me feel awful and gain weight not lose weight.