Hello,
By analyzing your history it seems to me that you have the infection of the gastrointestinal tract or gastroenteritis where diarrhea and vomiting occur.
Repeated hiccup may lead to tear in the mucosa of the stomach or the esophagus, resulted in bleeding and you vomited black colour liquid which is due to altered blood mixed with stomach acid and mucus.
As you are continuing your gastroenteritis along with upper gastrointestinal bleeding you should be checked by doctor in ER or urgent care for evaluation and further management.
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