@ldlauwers
When I was first diagnosed, my physician said he had patients that called them "brain zaps" like a shock of static electricity in the head. That's not what I feel, but sounds like what you describe.

I started feeling MetalHead the day I started Briviact. It was weird and bothersome, but at the same time I took it as a sign that it was 'doing something'. Imagine crumpling up a ball of Aluminum foil, putting it in your mouth, and chewing on it. Or like your head is full of Mercury. Especially around the temples. If you look up "Pinhead" movie - the visual is a guy with a matrix of pins embedded into his head. Kind of like that but felt the metal inside. It is background sensation - when its on its on, and in the beginning it was on a lot. Less so 2 years in, hardly notice it now.