Just a footnote. Or nosenote. I have had a headache, ranging from bad to head splitting, though not, I am guessing, anywhere near migraine status, but at times bad nonetheless.
This headache started Tuesday afternoon, and on Friday morning, as I write this, it is just starting to fade.
My conclusion yesterday was that it was my sinuses. Without giving too much yucky detail, I had some tension each side of my nose and the occasional "gurgle" from these positions, so me and Uncle Google reckoned it might well be related to my sinuses.
So I nipped down to the chemist yesterday to get some Sinutab and some menthol crystals (menthol, steam, bowl, towel) to help, and I think they have worked. There was a slightly unpleasant moment an hour after taking the first Sinutab when I had a nasty taste in my mouth, which I concluded was my sinuses draining. Anyway, just to report that I seem to be feeling better today. Hurrah.