I currently have a spout of the man flu (sore throat, phlem, blocked nose).
My remedies so far that appear to be working is max strength lemsip every few hours and cherry soothers in between to break up that cattarrh. I have also been taking Echinacea which has definitely helped build up my immune system over the past year as the man flu appears to be going already after a few days where as it usually sticks around for weeks on end.
So my advice to you my Flinky is to get some Echinacea in tablet or drink form and also hit up the Vitamin C (oranges or suppliment). Also attack it with some hot soothing drinks such as honey and lemon or lemsips etc.
If you're not a lover of drinks like that then hit up some flu tablets or ibuprofen. If anything they'll help you sleeps