Backache is caused due many reasons , it need proper physical assessment by experienced physiotherapist , proper cause of pain can be diagnosed by manual test , physiotherapist possess skills for it . After that proper treatment will help you to get rid of pain as well as recurrence of it in future . So find a good physio around to help you .
Next Steps
as of now you can take cold pack on affected area if it just a 24 hr before pain if it's more then 24 hr already take hot pack and apply any apni ointment .