John, Im sorry you are still having this problem with SOB. I hope there will be an answer and a remedy for you soon. An allergy could be the culprit, and i hope it is , since that would be more readily treatable. I never had allergies my whole life till i was in my 20's. Now in my 40's i seem to have some asthma components with my cf. I think i may have mentioned to you about my Dr. prescribing Singulair for me and it has helped a lot. It could very well be possible you may be having some allergic or astmatic reaction to something. Allergy testing sounds like a good idea to me.