Hello Dear Thanks for writing to us. As you are already on CPAP which indicates you have any form COPD. Most of the patients suffering from COPD are allergic to different day to day environmental things that they get in contact with be it smoke, dust, perfumes, pollens etc. but every patient is not allergic to everything. To determine this you have to undergo a skin sensitivity prick test to know your position. As you have described that it just has begun to affect you which may be the case as some patients develop allergy over a period of time. The best thing I would suggest is to avoid contact with allergens is to wear a mask. Some of the Ayurvedic medicines and pranayama may help you a lot like Anguraasav, Haridrakhand, Allergin granules and Bristol Syrup but they can be taken only after proper verification of your condition.Pranayama breathing excercises can be seen in videos online. Hope that helps Thanks