What I've discovered after 14 years as a diabetic T2 is that GP's don't know that much about diabetes. It's a specialist subject really. I've been on Metformin since diagnosis 2 pills twice a day. A few years ago I started getting strange systems such as swelling and sore tongue, body out of balance leading to falls and bumping into walls etc. Metformin can lead to B12 deficiency which leads to Pernicious Anaemia. Blood tests showed I had B12 deficiency. More recently in the last 2 years I've suffered enormous pain in my heart when I've walked anywhere. for the first year I thought it was Angina pain but a year ago I was offered Gaviscon and discovered that the pain was related to wind. The gastroenterologist I saw suggested, that , after 1 year of tests for stomach bugs, an endoscopy and scan of my upper abdomen, stop taking Metformin for 3 weeks. I did this and the terrible symptoms have stopped. I still get a bit of wind after eating but I'm assuming that this is because my stomach will have to heal. I was given an alternative drug to Metformin and take Humulin 1 injection once a day. So far, so good. I'm managing to get out and walk about and generally improve my fitness.