wishing you luck. I don't know about glumetza, but it took me about 2 weeks to get used to the metformin, and when I started the higher dose, the same thing.
I also got a side effect from the medication after a few weeks, terrible muscle pain in my legs, as if I had leg cramps that wouldn't go away. I treated this with a high vitamin B supplement, and don't have those symptoms unless I forget to take my vitamins.
With the initial gas and upset stomach I really had to remember that most people get past those side effects, and that the effect on my blood sugar was really important.
I hope your side effects aren't too bad and that you can get past any that you have. good luck
zen and the art of weight loss, finding the true path of en-lighten-ment