Just a random thought -
You might look into the BioSet method of detecting / eliminating sensitivies? There is a practioner directory on the BioSet site. (There are also books written by Dr. Culter that explains the technique. Completely non-invasive)Once you learn the technique you can do it yourself , which is a nice feature...It is very in tune with enzymes and the importance of digestion so it "fits" with the issues of CF...

http://www.bioset.net

We are using it to work on sensitivities from foods & vitamins to yeast & bacteria & pollen...