I was thinking the other day of the strange physical feelings I had running over the top of my brain and down the back of the skull. They started after my craniotomy operation to clip the Aneursyms in the brain 18mths ago. They stayed with me for 6 mths coming and going. It was like a cold sensation passing over the brain inside the skull in waves. Didn't hurt as such but a bit unsettling. My consultant said some people describe it as running water over the brain. Apparently there is no current understanding of why this happens. Maybe it is just the brain starting to heal itself. Has anyone else had the same feelings?