For the record, and in case it happens again (or in case anybody else experiences it): for the past week I've had fascinating asymmetric headaches. They're quite notable when I tip my head down to read a book or computer laptop screen, but they quickly go away when I lift my head or incline it toward the right. At first I thought it was a migraine phenomenon. I had a classic "fortification illusion" aura a week earlier, but it wasn't followed by a headache. I also had scalp tenderness which some sources (e.g., Wikipedia) mention as migraine-related. And there was occasional mild vertigo.

But would a migraine be head-orientation sensitive? Could it be an inner ear infection or a sinus problem? I had no issue with looking downward at the same angle for 12+ hours during a 48 mile trail run a few days ago, watching the ground and trying not to trip.

Frankly, I'm baffled. Fortunately, the pain isn't bad and I have an easy workaround: stop tipping my head down to read!

(cf. Migraine Visions (2001-11-29), OcularMigraines (2004-01-03), ...) - ^z - 2011-11-22