Thank u so much for ur replies ladies :-)

I went to the Doc today as this is driving me mad. The bad news is that it is either Tracheal Bronchitis or Whooping Cough :'-(
I have to go in Monday and get tested for Whooping Cough and he has given me Ventolin to help ease my cough, which seems to have helped a little. And even worse, he says the cough will last 4-6 weeks either way! :-(