Your concern is understandable. The burning pain that you are describing is more commonly seen in nerve
related issues. Since you have a history of sciatica
I advise you to meet a neurologist
who will be able to help you further. A recent MRI
of the lumbar spine
will help in ruling out the herniated discs. Ureteroscopy can also give rise to such problems specially the radiating type of pain. I suggest you start on Pregablin and methycobolamin combination of 75 mg at night for 15 days at night. If the pain is of neurological origin it should settle down with this. Hope this has helped you.