Welcome to HCM. I am Dr Anshul Varshney.
I have read your query in detail. I understand your concern.
He might be having Acute or Chronic Hepatitis C
Melena can occur due to coagulopathy
Melena can occur in acute or decompensated CLD.
He required PT/INR, and might require Fresh Frozen plasma Transfusion
This is my best advice for you with the available details, if you have any further query, please ask us.