Thanks for asking.
Based on your query, my opinion is as follows.
1. Decreased hemoglobin
has led to weakness and tiredness
2. Bleeding in stomach and esophagus
is leading to dark tarry stools. Bleeding is also seen due to hemorrhoids. Both have led to decreased hemoglobin
3. Upper GI endoscopy
is necessary for evaluation. Stopping of bleeding and nutritional supplements are necessary.
Hope it helps.
Any further queries, happy to help again.