Incident in game store

In July I visit the store . I knocked my head on a metal bar by the shelf . The bar was empty I could not see the bar when I bend down I knock myself. I immediately inform the casher she informed her till controller. The till controller said because they don't have stock that's way the bar was empty. Bit she didn't hear probably. Then I left the store in so much pain. I then notify the head office the next day. The store mannage calls me and ask me what happened and which I did. He did an investigation and contact me the same day and told me THAT MY INCIDENT WAS A SPILT OF THE MOMENT AND HE APOLOGIZE AND FROM NOW ON THE CASE WILL BE CLOSED. I was confused I didn't know how to respond to him . From that time till now I have headache 😭. I have tried to get more details on on my case but no one even gave me a gift to compensate. I have a mark in my face of my injury. Please advise what I need to do because I feel my case was unfairly. And still have pain