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This is Dr. David
black diarrhea is very serious
it means you are bleeding from your stomach or esophagus and you are loosing blood in your stool
over time, this can cause anemia and low red blood cell counts
you could even pass out from having too low of red blood cells
you need to go to the ER at the hospital right away to see a doctor to get blood tests
and to get your stools tested
and you need to see a GI doctor to do an upper endoscopy to look down into your stomach to see where you are bleeding from
do you have a hospital or ER close to you where you can see a doctor right away.
changing your diet will not stop the bleeding from your upper GI system.