Does anyone else get really sick when taking metformin? I get very nauseous and either vomit or get diarrhea when I take it. I have more energy after a while of taking it but with my school and work schedule, I can't just cross my fingers and hope I don't get sick in the middle of class or during a shift (I'm a waitress) so half the time I don't take it. Is there a trick to taking it or any alternatives?