I have studied your case.
back pain can be due to muscle strain
or gall bladder disease
or renal calculi
You may need x ray and Ultrasonography
And also check your vit B12 and vit D3 level.
Medication like methylcobalamine and analgesic will reduce pain.
You can do yoga exercises and focus on spine extension exercises.
You may consult physiotherapist for guidance. He may start TENS, or ultrasound which is helpful in your case.
If required you may need MRI spine.
Hope this helps. Wish you a speedy recovery.