What is the cure for a dry tickly cough, ok in the day generally then starts around 7pm and continues all night. It all started with a sore throat which lasted 2 days then the cough came and has been present for 7 days. At the moment i'm attempting to sleep at night propped up on 4 pillows because as soon as i lie down its ten times worse,have tried a couple of linctus's and soothers but not much good,does any one know how long this is going to persist for?