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This is Dr. David
your INR should be between 2-3
but taking warfain can make you bleed
and black diarrhea is a sign of bleeding from your esophagus or stomach.
you could have had some food poisoning or a bleed of a vein in your esophagus which can cause vomiting up black and black diarrhea.
you need to see a doctor to get blood test to see how much blood you may have lost
bleeding from your stomach is a serious thing.
you have to make sure the bleeding has stopped.
let me know if you have questions.