Hi, Kippy ~
I'm sorry to learn about your headaches and other pain. Obviously, this is something requiring the expertise of a licensed physician. However, to the best of my knowledge, the titanium mesh that covers the incision is secured by tiny screws and I seriously doubt they could all loosen to the point where the mesh could actually shift around on your skull. However, anything is possible and I know that one of our members did have to have at least one screw removed due to it's gradual loosening, so this is not totally beyond the realm of possibility.
In my opinion, you should not allow yourself to suffer while waiting to see if the pain will go away. I suggest that you consider calling your doctor, explain the sudden onset of pain in your skull and allow him to examine you and, one hopes, discover a cause of your pain as well a offering a solution. Let us know what happens. Thanks.
Jim