I had some lower back pain for a while there.

Went and saw a physio, etc for it. I wrote up all the advice he gave me in another post. But basically the physio told me to strengthen my core...lots of weird little exercises over a number of months fixed me up. I still do them every other day along with stretching my left gluteus medius...which was the main culprit in my case...and in most others from what Im told.

Google gluteus medius stretch and try one. Odds are it'll hit the spot thats hurting.