According to your history you have yellow eye color, that might be jaundice
you should do blood tests for serum bilirubin
( direct and indirect both).
The more imp problem is black stools, that might be due to Gastrointestinal bleed.this needs to be investigated more,i would rather advice you to do Ultrasonography
scan of abdomen.
You should definetly get reexamined.
hope for your early recovery,
Dr Hari Om Chandrakar