An update to my post earlier today: the headache remained mild and went away after a couple of hours and some Advil.
This is, once again, completely uncharacteristic of my decades-long headache pattern.
The only thing that has changed is that daith piercing. I am absolutely certain this is not merely some hinky kind of placebo effect. I was bracing myself for a full-on headache today and it didn’t develop past an oddly annoying, vague kind of thing that was banished by some ibuprofen.
Weird… But very, very welcome!