lower back pain

so I've had this lower back pain for quite some time, 2 months really, the only thing I could possibly think that caused it would be I was play fighting at a lacrosse game and I fell to the ground on my butt, but it hurt for maybe 20 minutes during the game and went away completely, two days later, I got the pains and it's been here everyday from them on, I'm not really sure what I'm looking for here, maybe advice on what couldn't happened? or what I could do, I've tried cracking it, taking warm shower, icing it, and massaging it, nothing works.