it could be many digestive complications go to a gasto /digestive specialest asap you could be bleeding from some where in your systm . black stool is normaly an indication of bleeding .do not put off going to a hospital or doctor now. best of luck.
Dark stools are often associated with bleeding in the upper GI tract, which would make sense with your nausea. Blood in the stool is brighter red when it's from lower in the tract, as it's more fresh. Your dark stools might just be a reflection of your diet, or could be an ulcer - who knows? But you definitely need to see a GI specialist soon if your symptoms persist.
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