Back pain may be associated with many conditions, with your description one can only suggest you to go for a through evaluation and detailed subjective assessment of the condition with nearby physiotherapist. Also the information provided in the query is very much insufficient. A physio will be able to provide you the best possible protocol for relieving pain and other symptoms via electrotherapeutic modalities and exercises based on the assessment. If you already have gone through assessment or any other tests, then let me know the details, only then can help you with the cause...