I'd keep pool water way out of my middle ears and sinuses if possible, the chlorine is there to prevent the tons of junk in the warer from harming you, but if you bring the water inside you're making it much easier for a bug to cling to your mucous membrane...
Never had a sinal headache, so I'm not sure if I'm already immune or that water just never got there (though they did get into my middle ear). I found that the water up your nose feeling fades if you get that a lot.
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