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Thank you for your question.
Black colored stool is almost always something that should be evaluated for blood loss from the upper part of the intestine i.e. the stomach, duodenum or the foodpipe (esophagus).
This must always be evaluated with an endoscopy ASAP.
Your eating disorder may have had something to do with your current symptoms in that it may have caused some damage to your esophagus or your stomach leading to inflammation of the stomach (gastritis) or ulcers in the stomach causing bleeding and black colored stool as a result.
I think that an ultrasound that you are having done is to rule out things like gallstones, otherwise I think that an upper GI endoscopy would be the best test in your case.
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