Hi , I had these problems, been diabetic for 8 years type 2. Had a lot of problems with st metaformin, ended up with surgery after a colonoscopy. I had been asking GP foe 3 years if the bowel problems and discomfort was the diabetic meds, he of corse told me no. The gas to consultant on the other hand said it was, and it's to do wit the fillers in them, I am on Glucophage Slr and much better, had to have a different brand one time and problems re occurred. So OP , please go to your GP and ask for a referral. I did, and am glad. Good luck.