My two year old started coughing in August. It is now November and he hasn't stoped. We've seen the general practitioner (GP) (there are no pediatricians available freely in London) 4 times (maybe more), and every time I hear the same thing - viral infection, it will go away. But it doesn't. It seems to go in cycles: starts of dry, and infrequent, and continues to become wet and he coughs every hour or so. Then it slows down again, and goes back to being dry. About two months ago, we've gone to the emergency room where they did an X-ray which was clean. The GP also does not hear anything when he listens to my son's chest and back. What do I do? Is is allergies? We have no pets, but it is an old house so I am starting to suspect dust mites. I am frustrated and tired to guessing. Please advise. Many thanks in advance.