Try living in Virginia with all the wet leaves and molds... I can't breath ever!!! I've never been stricken with the flu, or had a flu shot, but allergies.
My only relief is during winter in the Shenandoahs for some skiing.
That is my feeling whenever I walk into the Linen's section in any shop
, Hopefully I didn't just jinx myself. 



. I find gargling with hot water with a pinch of salt is very good for sore throats. For the pain take whichever painkiller you are not allergic to, linctus for the sore throat. Take plenty of steam to unblock you sinuses and I know it sounds disgusting but try not to "breath your snot inwards, as this ends up blocking your sinuses and also gets swallowed into your stomach"