Dunno If you guys know this but this is very well-known trick in my country.
This works when you do this BEFORE you get an actual cold.
If you feel a little bit chilly or have a headache, blow a hot wind to the back of your neck with a hair drier.(right before it burns your neck)
It always helps when having light symptoms! If you do that for like 5 to 10 minute before going to bed, by next morning you are completely cured! You should try it!