My OB put me on metformin and this is my first night taking it. I woke up with THE WORST stomach pain of my life. My doctor said it would cause my stomach to be upset and some discomfort. How long does this last? Did you do anything different to help with the side effects? I have Zofran and I hope it goes to help me a little bit. Boyfriend and I are TTC, I just hope these side effects subside. :/ Anything Helps.