Suggest Treatment For Leg And Lower Back Pain

I am from Sudan,51years old,female,suffering from right leg ,low back pain.MRI declared large disk between L1 S5 , docters desided an operation. before it I did many blood tests all are normal acsept the ESR it was 100 mm,hr ,they gave me prednisolon injection,by the way i had anal fissurectomy operation before one month has it any relation with ESR ,can i reduse it? why was it so high? a mi in danger? and what other test shall i do? how long does it take to be at normal limt?