When I got diagnosed as epileptic & started taking my meds, they made me SO ill I was throwing up virtually all day, so my doctor prescribed anti sickness pills for a few weeks, just until my body got used to them.
Idk anything really about taking metformin, but is it a similar thing in that the side effects will lessen as your body learns to tolerate it? If so I'd say ask your doc for the sickness pills, helped me a treat!