I'm just getting through a throat infection and flu and some other stuff, best hing I can recommend is fresh orange juice, plenty of Vit.C and the acidity can help get rid of clingy nasties in your mouth from what I've been told.
Every morning I have a hot water with half a squeezed lemon and a thumb of grated ginger. Seems to work for mouth hygiene and colds.
I'd also consider speaking to your GP?
I would second the Lemon and water every morning. I don't have the ginger I might try that, but the lemon is really refreshing. It will give you a good boost of vitamin c every day.
As all have stated above, getting a good dose of vitamin C in the morning either through lemon water or orange juice will help out greatly. The Ginger is also good to detoxify the body.