Have you tried the extended-release metformin? Even though it's easier for some to tolerate, I had to work up to the full 2000 mg dose gradually, every few months over about a year. It never did much for me, so added Glipizide to the mix after almost a dozen years managing with only diet and exercise from the beginning at age 55. Even then -- nothing worked nearly as well as exercise, so I kept that up for the next 13 years before adding insulin. Discuss with doctor, and explore alternatives.