MRC-funded grant proposals on ME/CFS by year, 2003–2023, along with the total number of proposals received that year.

[Kitty]

I've not been aware of having this symptom except when I'm in the run-up to a migraine or already have one.

I just meant it's fairly common in conditions like migraine, 'flu, hangovers, etc. The level of sensitivity will vary, but most adults can probably remember a time when they wanted to draw the curtains against bright sunlight, or found noise from a construction site made them feel more ill even though two days ago they could tune a lot of it out.