I Have Allergies Quite Bad And Have Been Using Pataday

I have allergies quite bad and have been using pataday for my eyes. When I first used them I felt as though I was getting immediate relief. Now my eyes itch and run and then 4 days ago one eye started to swell. Not sure if it is the drops or the pollen is just worse than ever. I stopped using drops, my eyes continue to itch and not sure what to do now. In the past, over the counter drops have done nothing.