Start with back exercises and daily walk . Maintain a good posture.

Dear sir Low vitamin D can cause some times generalized body pains, you need to get treated for that. Some times some non specific back pains and neck pain will get relieved with vit. D How do you know you have urine infection, have you done any test for that. If some microbe is grown in urine you need to use appropriate tr. For that Better to consult a doctor

U need vitamin d and treatment for urine infection,  do teleconsultation for same