Ok I've got hay fever. What should I do?

Allergies. See an allergist to determine the best approach to treat your allergies. Do not waste your money on crappy over-the-counter antihistamines that are marginally effective. See an allergist who can find an excellent guide to work with you to get the allergy symptoms under control.
Hay Fever. Untreated hf can lead to complications like sinus infections or even asthma, affecting the quality of life. Antihistamines and nasal. Sprays help but may quit working after a while. Avoidance of pollen is helpful. See a board certified or trained allergy specialist for proper testing and if indicated allergy injections to build up the immunity. Oral allergy treatment is not as effective.