Morning visit to the doctor (not the one that gave me the telepathic diagnosis) gave me a clean bill of health and a closed sick note. Get back to work young man! But since the ENT chap said you should get your head x-rayed, go and do that anyway (although they won’t find anything, I think your sinuses are fine).
Afternoon visit to the x-ray machine gave me a stunning view of not much brain and very much sinus fluid. Back to the ENT tomorrow.