I was diagnosed as a type 2 diabetic just under a month ago. Was prescribed metformin, initially 500 x 1 then move up to twice a day. I have generally felt awful but started to feel better towards the latter end of the week. Have had a bit of tummy gripes but not too bad other than that. Have diagnosed ibs anyway so tummy is always a little off. Anyway it is my birthday so thought I would have a day off the safe food and went out to an Italian for a meal. Had a pepperoni calzone and about half way through it started with awful tummy pain and diarrhoea. I have had this before and no problems so now I'm wondering if it's the metformin causing this reaction. I know that I should eat heavy food like this but it was just as a special occasion for my birthday. Anyway my question is does metformin cause any dodgy tummy issues if the wrong food is consumed?