It is possibel that you have had a minor CSF leak during surger that has lead to these episodes of recurrent headaches, this is a difficult to diagnose condition, and the doctor seeing you needs to be specifically looking and testing for it to make the diagnosis.
Nerve injury is generally relatd to the optic nerve (eye) and is rare.
Your symptoms do not seem to be related to this.
Please ACCEPT the reply, and give a BONUS if it was useful. If you
need more information, just let me know.
Regards
Dr. Gupta