Hello everyone. I am debating wether or not I should try metformin again. See my problem is that I have a recto vaginal fistula

. When I take Met it really messes up my tummy, and I get the "runs".
Under a normal circumstance I could deal with that. However for me because of the fistula that I have it means that it comes out of both my anal, and vaginal openings. To plainly put it that is pretty damn gross. I loathe getting runny stool anytime, muchless constantly because of met.
My main question is does Metformin Extended Release still cause tummy trouble? All I have tried was regular Met, and I am hoping Metformin ER would be better for my tummy.