Black Stool Diarrhea More Condition_symptoms Black Diarrhea, I Need Answers?

Black Diarrhea, I need answers? - black stool diarrhea more condition_symptoms

Okay, got so I just had the flu last night AFEV, and then went into the bathroom. I know it's stupid, but when I finished, I felt better, but when I looked in the bathroom, I saw black, m, the water was black, but my stool was dark, but diarrhea was black, why? Help