question: I have had a cough now for 12 weeks it starts with a tickle that starts me coughing followed by sneezing and a runny nose I also can feel mucus down my throat I have had 4lots of antibiotics a chest x Ray that was clear a course of steroids a nasel spray I have asthma and thyroid this couch is so annoying that it does my head in oh and the doctor also gave me some medicine to break up the phlegm I don t know what else to do can you help please