I thought I was getting this sinus pain in the afternoon from spices that chicken was cooked with (I don't cook it, I buy it already cooked). But then I did a little experiment and it seems that the cause is more likely the mineral water I am drinking. Has anyone heard of a reaction like this?
It is Nestle mineral water and the composition is so (all #s are mg/litre):
I get headaches if I drink a large bottle of mineral water. I've replicated this with Gerolsteiner, Apollinaris and Perrier. I think the mineral content is in excess of what we've evolved to rehydrate with. It's also possible that it's the carbonation/acidity (naturally-occurring or not) that has this effect. I never get headaches otherwise, so this effect definitely stood out to me.
You might want to halve the amount of mineral water you're drinking and replace it with spring water. When I do this, I experience no ill-effects.
I don't drink mineral water, but I get sinus pain from drinking certain green tea. I've gotten it from different brands, so I don't know if it's an additive or if it's the actual tea that does it. Herbal teas and black teas do not cause the pain.
After drinking it (sometimes immediately, sometimes an hour or so later), I'll get an intense feeling of congestion in my sinuses along with dry eyes and usually a headache follows. I have stopped drinking green tea as I am satisfied drinking other types of tea that don't give me this issue.
Funny, the first time I drank mineral water, I got a horrible headache!!! My first time was at 35 years old. Never got the headache again. Same thing happened with my 10 year old son. Horrible headache at first - then he loved the stuff with no headaches.