According to the history, the patient is suffering from cirrhosis and has taken alcohol.
The black vomitting maybe due to bleeding.
He might have a variceal bleed.
Next Steps
Go to a medical gastroenterologist immediately and consult, The patient might need an emergency upper GI scopy for evaluation and further treatment.
It seems an emergency situation from the history, I would urge you to immediately meet a medical gastroenterologist.