[stordoff]

I have something vaguely similar when my migraine-like[1] headaches are at their worst - some words just look wrong, even when I'm 100% certain the world is spelt correctly. It's an odd feeling, made especially weird as when that is happening I find Japanese kana much easier to read, which is normally something I find rather difficult.

[1] Not formally diagnosed as migraines (migraines don't typically cause a single headache that never goes away for years, but just fluctuates in intensity), but my sister has been so I suspect there is a link.