Hi, thanks for writing to HCM.
If you have pain originating from the back and radiating down the leg (on backside of leg) into the ankle & feet is most likely to be Sciatica
and is due to a protruded lumbar disc causing compression over the nerve root
scan of the lumbar spine
will help in establishing the diagnosis.
In the meantime,
* Avoid excessive forward bending
* Take adequate rest
* Use analgesics & muscle relaxants as needed
Consult an orthopedic surgeon for further evaluation and management.
Hope this information is helpful. Good day