Hi Cathicaf 23 and welcome to this forum .....
I am so sorry you have been experiencing such awful pain near your surgical scar. That has to be miserable.
It is a bit unusual to need to repair the mesh or tighten screws so there may not be anyone regularly checking this forum to tell you about their experience.
I am assuming you are going back to the neurosurgeon who did your initial surgery. Was your surgery for trigeminal neuralgia? I had MVD surgery for trigeminal neuralgia 20 years ago in Pittsburgh, PA. I had immediate relief from the horrible trigeminal nerve pain. I had headaches for a couple of weeks, but nothing compared with the pain before surgery. That part of my head is still dented in but I never had any issues like you are describing.
Have you thought about getting another opinion from any other surgeon?
Many thoughts and prayers.
Clarice