Probably an ulcer: Your symptoms of nausea and black stools (which we call melena) are very suggestive of a peptic ulcer (either gastric or duodenal). If left untreated, life threatening bleeding or perforation could occur. I would recommend immediately starting a proton pump inhibitor like prilosec OTC once daily, 30 minutes before breakfast. I would also make an immediate appointment with your PCP.
Answered 8/13/2017
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