s happened to me before, more than once, and seeing
green poop, can literally turn your face
green too -- hell, it is scary, but rarely anything serious. Now, was there any blood? If you saw blood, light or dark, see your doctor immediately.
When was the last time you went and had a check-up, with all the necessary liver tests? If it has been a while, more than a year, you may want to go see your doctor.