I had significant allergies to dust, molds, pollens, and some foods all of my life. Since starting the PB in June of last year, the allergies have disappeared. I wouldn't say they are cured; rather, my immune system isn't under assault from my diet and thus can handle exposure to the allergens. If I ever go back to crappy eating, the allergies will probably come back.
Note also that the exercise, sleep, and tension reduction aspects of the PB are also important in combating allergies.
Best of luck to you...may your experience end up being as good as mine has been.
Live your life and love your life. It's the only one you get.