Since December I have had a really dry tickly cough. It happens every couple of hours around the clock and keeps me up for hours every night. It always starts with a tickly throat and then proceeds to a cough that makes my throat even worse. I've been to see my GP countless times since it began and have been prescribed antibiotics, steroid nasal spray, throat spray, inhalers, antacid tablets and have even had an x-ray, all of which have failed to work or diagnose a problem. I'm constantly drinking water, chewing gum and using mouthwash to ensure that my mouth isn't dry. It's completely taken any enjoyment out of my life as I am constantly coughing or just have a general discomfort in my throat. Any help on what to do next?