Has anyone found they just cannot tolerate Metformin, took it for 16 years no problem. After 3 months of unxplained tummy troubles (really bad) finally Dr. put me on Slow release, after 6 months tummy probs started again. I have now stopped taking the tablets , really scared , 3 days now without and I am feel fine but blood sugar is high. Can anyone tell me if they had this problem and what is available without causing tummy problems.