 [ Symptoms ] i have had diarrhea for 4 wks and my stool is turning dark green i have not changed my diet and i do not eat fatty foods i have not been eating very many vegetables but i do not eat fatty foods i hardly sleep due to the pain in my stomach i have had this diarrhea problem for over 4 weeks and it is causing me to be nauseated my stool is turning dark green greener than grass and it will come out as if someone put spinach in a blender with water [ Disease ] hi then its time to go to your doctor if you do not have one the er asap good luck