hi, i had flu symptoms about 4 months ago, and when that cleared up i still had a sore throat and a chesty cough. over the past 2 months the chesty cough has got worse and worse, it s constant, and restricts me from doing anything too physical such as jogging. it s now unbearable, and hurts so bad. im female, 16, fairly tall, and a healthy size. help? :(