Burning type right-sided lower limb pain of recent onset. This type of pain (burning pain radiating down to the foot) fits into the category of sciatic nerve pain (commonly called sciatica). I would suggest a consultation with a doctor (orthopaedic/spinal) who can examine you from this point of view. Obviously the examination will include rest of the lower limb as well. X-rays tend to be normal if you have any soft tissue problems such as prolapsed disc (I am not necessarily suggesting that you have it) leading to such symptoms as you have. If the clinical examination points the pathology to your spine the next investigation forward will be MRI of your Lumbosacral spine. In the mean time I suggest you continue with pain-killers. A course of physiotherapy directed to your back will be of benefit as well. Hope this helps in understanding your condition.