you should see a doctor to see if this is muscle or bone related. the lower back is the most common area to experience pain throughout life. Alot of times it is just muscles but seeing as yours began after an injury, you should really see a doctor. Take care.
Hello!
Take a week off from football.
Apply hot compress on your lower spine area and massage with some NSAID gel. Take pain killers intermittently and wait for the inflammation and pain to subside.
If the pain continues then you would need an X-ray scan and follow up with an othopedician.
Take care!