Pain in lower back while playing basketball or running.?

Ok, so there is this pain in my lower back right above my on the left. The only connection I could see is maybe it happened in my athletics cl while we were doing this workout were you lift your head and your legs in the air and that might have been it but im not sure because that was like a week ago. It happens when i jump (like for lay-ups and rebound and shooting) and when ever im running. Is there anything i can do to heal this as fast as possible. tryouts are coming up and i wanted to play.