A few days ago, I hurt my lower back playing hockey. Since then, I have been experiencing mild numbness in my left foot and along the back of my upper left leg. It feels like I've injured the my left glute muscle and my left calf is very stiff and sore. As a result, I can't really walk properly. The pain varies depending on the way and for how long I sit. When sitting down, the muscles in my leg often spasm. I definitely experience less pain when lying down or standing than when sitting.

The injury was not due to an impact or anything, I just overstressed my body while playing.

Please let me know what you think this might be, and how I should go about healing my leg.

Thank You!