You fell down on the left side of the back and developed pain the mid back and right side right under your ribs after 5 days. When you press that are it is painful - indicates Hematoma
- may take 5 days to form and create pain.
What you need is X- Ray ribs, Antibiotic, Anti inflammatory pain killers and local application of pain killing gel, hot water fomentation and rest to that area.
If possible and if necessary MRI
of the spines around that injured area may be needed.