avocados. mostly.
i also increased the amount of fortified soy milk i was drinking dramatically, started eating a specific kind of highly fortified cereal and started eating fortified yogurt. i replaced my store bought caesar salad dressing with a homemade dressing that used fortified probiotic yogurt & fortified soy as a base. in the process, i went from getting about 60% of the rdi on a good day to getting over 200% of it, regularly. i also started eating eggs far more regularly, instead of as a once-a-week top-up.
i think that was a potential cause. i don't know...
the increased amount of soy also boosted my vitamin d count. low d in the winter is a known risk factor for ms.
as seems to be normal in this country, the doctor assumed i was exaggerating it, and told me it was just a headache. so, i don't really know. again, universal coverage and competent care are different things.