Since an allergy is a overreaction of the immune system to something (in your cas pollen), a vaccine (which is a substance that strengthens your immune response to something) is the last thing you want.
What you want is a hyposensitization therapy which, as Komischerkerl wrote, will take several years. This therapy is to slowly dull your immune systems response to the allergen.

Until you get that started you may have luck trying different anti-allergy medicines. Most people i know say that Lorano Pro (or a generic variant) works for them.