My methods are brutally simple. Into the shower, with the water hot to the point of discomfort. Stay in there until the hot water tank runs cold (I've got one helluva efficient tank and haven't actually managed to run it cold yet). Then take a double shot of lemon juice/honey/hot water/brandy. Then under the quilt and stay covered, no matter how much you want to kick it off. Hourly doses of hot tea, or cool OJ.
Brutal, but effective.