Thanks for the query to H.C.M. Forum.
Rod break ? impossible , no chance of any rod break .
In my opinion get in an X ray
( fractured ) and consult another orthopedic surgeon .
Now the reason of the pain, so excruciating may be due to sequestrum formation in fractured bone . Diagnosis can be confirmed by c t scan of bone .
In my opinion consult another orthopedic surgeon and get his opnion and treatment ( 2nd opinion).
Good luck. Dr. HET