Bowel Disorders :: Dark Brown And Black Stool

I recently broke up with my girlfriend and had a few days of pretty heavy drinking, 12+ beers throughout the day and night each day. I have always been somewhat of a heavy drinker and shortly after those 3 rough days of being down and in a dark place, I started to notice my stool was very dark brown or on the verge of black. It doesn't stink though. I read up on reasons why this would happen and the bleeding obviously scared me because of the drinking. Although I also had been taking some Chlorella supplements that contain iron off and on but they never gave me this color stool before. Sometimes green. Along with some Pepto Bismol the day before but only 2 doses, which is another cause. Some purple flavored sports drinks and even prune juice. So all of this can add up to the dark colored stool from what I read but I am still very worried. My stomach has been uneasy and makes me feel like I don't want to eat anything. Not sure if it's an upset stomach or still from the hangover. I'm into day 2 now, and it is still there and unsure when it should go away if it was from something other than bleeding? It doesn't seem to be dark black like tar or stink so I am keeping my fingers crossed. I am 27 and have always been very healthy other than my drinking habit which I am obviously going to drop because this has scared the poop out of me

Its Friday now and have dropped all the supplements and juices to see if it goes away. Just not sure how long it would take to go back to normal since I took multiple things that could cause it. I guess otherwise I will be calling the doctor on Monday.