New to this thread, need some answers

Hi, I usually post on the depression forum but have been having so much trouble breathing and wheezing lately.  I had bronchitis 3 times this winter and was on 2 inhalers plus presdnisone and each time saw the dr. I had a nebulizer treatment which really worked.  The prednisone helps a lot but i climb the walls from it.  I went to see a lung specialist and he said my tests showed I didn't truly have asthma.  I did have trouble with the blowing test to measure what I exhale.  But nothing really shows a problem.  I still have to have a chest x-ray and another breathing test.  My PCP thinks it might be dust mites.  My wheezing is worst in the morning so maybe that is the case.  I went out and bought all new hypo-allergenic pillows, dust mite covers for them, a dust mite cover for my mattrress and a new hypo-allergenic mattress cover.  I am also having a company come out who specializes in cleaning mattresses and sucking out the dust mites and then putting down a protective coating.  They wil also clean the carpet and protect it but it is not a wool carpet so doesn't shed.  Has anyone else had a problem of unexplained wheezing and what did you do about it?  I am sick of using inhalers every day.  Will an ion machine that takes dust out of the air help?  Any answers you can give me would be greatly appreciated.

Thanks for your reply.  I am going to check into a HEPA filter.  As far as the Gerd, I am on an acid reflux medication and have been for some time.  It has worked very well and I have no more problems with the Gerd since on this med.  It is an interesting thought though and I will ask my dr. some questions about it.  It is very hot and humid where I am right now and I know that this weather aggravates my breathing.  I have also lost 40 lbs in the last year so that should help with my breathing although I never had a problem before because of weight. I will see if the mattress cleaning and all my new hypo allergenic bedding helps me.  I do have central ac in my house so that keeps humidity out.  I'm just not sure what more I can do.  I am banning use of any aerosol products in my house.  Hope some of this works. Any other suggestions would be appreciated.