"My illnesses tend to be upper respitory in nature. I seem to be prone to Bronchitis, which I don't presently have. "
If this is a lifelong thing in which you get a bug and then can't shake it for months (even with steroids, multiple different antibiotics, etc...), I'd put BIG money on the subclass 2 and 4 deficiencies. This is EXACTLY the problem they cause.
It was my allergist aka IMMUNOLOGIST that finally tested me after lifelong problems.