I wonder if it could be nerve related. Did you or your doctor bring up that possibility? Id ask if an EMG and/or nerve conduction study would be useful. Frequently in Neuropathy there is the type of pain you describe in the feet and/or toes. Do you have type of sexual disfunction that started after your surgery? Post surgical Neuropathic pain can occur years after surgery. Just a thought.
Best of luck to you,