I am getting violently sick after eating meals. The diarrhea is horrific I haven t made it home in time many times recently. I have found what I think is an undissolved Metformin ER pill in the feces. Years ago I had to go off of regular Metformin for the same reason. Now it s occurring again. I ve stopped taking my Metformin ER (2 500 mg. tablets, twice a day) today. I ve been a diabetic for 14 years. I also take Glyburide and Farxiga. I am calling my diabetes doc in the a.m.