Don't wet your hair or if you have to wash it, dry it immediately after shower, don't let it air dry or sleep with wet hair.
Wear socks ALL DAY EVERY DAY until you feel you're out of danger.
Drink ginger, honey and lemon tea waking up and before going to bed
Eat all your day's meals on time.
Cover yourself to go out (wear a jacket of sweater, unless it's summer. If it's summer hot where you are: try not sweating and then going straight inside spaces with a/c)
Don't put a fan directly in front of you (it will make it much much worse)
Shower early or mid-day. Avoid night showers or windy weather (even if covered).
Try doing all of these until you feel you're stronger or sure you'll not get the cold/flu.