Hi Susie,
Abdominal pain and nausea are some common side effects of metformin. I am lucky in that I never experienced these but they ARE common side effects.
Make sure you are taking your metformin with food and make sure you let your
doctor know you are having these side effects.
As to how long you have to put up with these until they go away?? Thats a good question and the answer is, It varies with the individual. If your reaction to metformin is severe and this doesn't eventually subside, they may simply move you to another equally effective drug. Sorry I couldn't be or more help or offer you a light at the end of the tunnel.
Warren