Chronic Cough; Any thoughts for help or remedy?

I have chronic coughing up wads of green phlegm dozens of times a day, wake up with swollen sinus, almost black out with coughing fits, had this for 10+ years, probably no cough when sleeping, cough with shortness of breath, have not taken a deep breath in years with out cough and feels as if I just breathed in vinegar vapors,

Sometimes it feels like upper lung soreness, most of the time it feels like throat, other times sinus.

CT Scan and Barium swallow indicate nothing, tested for stomach acid-nothing, tried steroids, inhalants, asthma meds, Tried a full week w/o bread or dairy-no change.  

I am 58, and can no longer exercise and now have gained quite a bit of weight but am still active heavy duty gardener. This all started before the weight gain.

Been to ENT and lung specialists, they seem to go as far as their profitable tests go then I am on my own again.

Thoughts appreciated.

[Red_Star]

Have you ever had your immunoglobulins tested? Immunoglobulins (Ig) are antibodies.  There are 5 classes of immunoglobulins: IgG, IgA, IgM, IgD and IgE.  IgG is further subdivided into 4 subclasses: IgG1, IgG2, IgG3, and IgG4. Symptoms of an immunoglobulin deficiency include recurrent infections, especially of the respiratory tract (sinus, lungs, and ears) or gastrointestinal tract, and/or chronic diarrhea.

Nutrients for good lung function include

Vitamin A
B vitamins (B1, B2, B3, B5, B6, B7, B12, folic acid)
Vitamin C
Vitamin D
Vitamin E
Magnesium
Selenium

[Emerogork]

Are these immumoglobulins ever-present? Are they affected by antibiotics?

I have been through a myriad of medications that they claim should have taken care of it.  Interesting it remains that no one can explain it.  I almost wish I was a heavy smoker then I could blame it on something and I might get more attention...

Instead of a list of additives, can you suggest a few foods that might cover the best of them? I just heard that Broccoli sprouts seem to do well in curing nasal problems.