Metformin wind

I was diagnosed as diabetic type 2 a couple of weeks ago, and they've put me on metformin 500mg twice a day. I have noticed that i get a sore tummy after taking them, and produce quite a lot of foul smelling wind. I've always gotten really tired and sleepy after eating, so that is nothing new.

Is this normal?

It’ll be Metfartin from now on then.