Have a gripping pain below left rib and takes my breath away. I wonder if it is the sigmoid colon? I do not know. A few weeks ago had macrobid and had constipation followed by flecked tiny bits of stool. Sister told me they can get stuck in intestinal system anywhere. The organ seems to quiver at times. My temperature is up by less than a degree constantly. Any ideas Doctors? Thank you Lori S.