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I've had an Oasis (gen2 recently) and do have a Sage.
It has to absolutely be only the front lights. The actual eink can't be the cause, assuming the font & size is the same and it's not a reading glasses issue. I started getting terrific stabbing & sickening headaches in the late 1990s and it was simply I needed reading glasses. I'd never used them and my laptop screen was closer than my previous CRT! First laptop. Laptops are handy, but not always ergonomic, so years later I used a separate screen and keyboard on the laptop at home.
I'd recommend never using front light and only using suitable for you ambient lighting.
Migraines are not well understood.
There also can be very severe headaches that can be photosensitive from either badly congested sinuses, alcohol, dehydration, lack of blood sugar and wrong (or none) reading glasses, or stress. Or more ominous causes. Many headaches can also be accompanied by nausea and not respond to traditional tablets.
If dark chocolate (75% to 85% cocoa) makes it worse it may be be classic migraine. If that relieves the symptoms then it's sinus related. Decongestants might give short relief, but experts saye they make sinuses worse. Cocoa is safer than cortisone type drugs, possibly it's the Theobromine that helps.
Migraine can be triggered by chocolate or oranges (Don't try Terry's Chocolat Orange!) and perhaps it's the caffeine (so tea, coffee, cola bad too) or citric acid (any citrus food and added to other things). However the underlying causes of migraines are unknown.
Make sure it's not something else, because most of the "not Migraine" migraine-like headaches are more treatable and better understood.
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