If you truly have seasonal, pollen, etc allergies there is not a whole lot you can do. Allergies will improve with a PB lifestyle, but won't necessarily go away so don't freak out if they still bother you.
When I changed my lifestyle, my allergies improved but they are still around. However, my asthma disappeared completely after 39 years. I do still have to get allergy shots once/week but putting allergens into my system is much better than loading it up with chemicals.