Thnks for your query.
As your x-ray revealed nothing so underlying fracture
has already been excluded. The area is swollen, bruised and painful. For that you have to undergo some conservative management like
1. cold compression locally over that area
2. apply analgesic
gel locally twice daily
3. oral analgesic in the form of ibuprofen
along with ranitidine
4. keep moving around. It will make no worse to you.
Dont worry it will get better spontaneously and bruise will disappear by its own through sequencial colour changes though it may take time.