--I don't know why a doctor would dismiss foot/leg symptoms as not coming from the back/lumbosacral spine just because the symptoms are bilateral, as so many types of degenerative disc diseases and other compression problems of nerve roots from the spine can lead to such symptoms; MRI of the lower spine is supposed to be on the short differential diagnosis testing list for such symptoms.

Symptoms of spinal/nerve root compression can be exactly the same as those resulting from a more systemic condition that effects the lower extremity nerves.