Brief Answer:
No need to worry
Detailed Answer:
Thanks for asking on HealthcareMagic.
I have gone carefully through your query and understand your concerns. I would insist you to try Tab. Aleve (naproxen) 500 mg one or two tablets together when needed for headache. In spite of the removal of the epidermoid cyst you can still get some pain and numb sensation and there is no need to worry about it.
Let me know if I could help further.
Regards