Hi, can anyone offer advice on a problem that is causing great distress. I am 48 male and for the last five years have had a worsening respiratory problem. Nobody seems to be able to diagnose what it is but it's causing great distress. As the day progressess my nasal passages get more and more blocked until I can only breathe through my mouth. I talk to groups for a living as a trainer I keep having to stop for breath and have to push air out up through my throat after a few words. This has actually cost me a job interview the other day. The interviewer had to stop my presentation and asked why I seemed to struggle to breathe as I speak. It is destroying me and I know that this one problem lost me a new job.It it worse in damp or extreme hot days but always gets worse as the day goes on-afternoons and evenings. I actually thought it was a side affect of Zolpadem (ambian)sleeping tablets which I have taken every single night for five years. It was the five years coincidence that made me think that(this problem seemed to come on around that time and got worse.) But when I suffer(every day now) I notice that my sinus passages feel physically completely blocked and speaking and breathing through just the mouth causes stress and embarrassment in my job. This is why I don't know what it is, a combination of blocked sinuses,asthma and stress? It happens every time I drive in the car too. Please can someone help. I have the most unimpressive doctor in the world who simply seems to exist to write prescriptions.I really hope someone can help.Thanks