Welcome to the Health care magic.
In my opinion you have neglected yourself a lot .You should immediately consult the neurologist
He will investigate you with MRI Spine and other relevant investigation to know the cause.
Possibilities are that some compression is going on in your lower spinal cord
or you might have met any injury
or some degenerative changes are taking place in your spinal cord.
Treatment may be possible according to the diagnosis made.
Hope your query is answered.