Not only is facial pain uncomfortable ... and occurs in clusters of time. It causes pain on one side of the head, forehead, ...

The pain tripled as I flew home and I couldn’t see out of my right eye properly ... massive patch that covered a quarter of my face on the right side and I had to keep changing the dressing.

It manifests itself with photosensitivity, tearing of the eyes, and - not in every case - sudden headache and eye pain. This ...