How can i get rid of a pain on the right side of my waist?

i love playing cricket .... and i am a right hand medium fast bowler ... last year i played with a lot of enthusiasm ........ but this season whenever i go out for practice the pain builds up very badly.It's at the right back of my waist just above the hips. My seniors advised me to have good warm-up before practice ....... i tried that but it still persists ..... please advise me what should i do to get rid of this ........ is there any exercise which you can advice me???