I rarely get heyfever these days but when I was a teenager/young adult I was tormented by allergies practically all year round.
I saw my Doc and he sent me to an allergy specialist. He did a scratch test on my arms and then made up a solution of the things that I was allergic to. Over the next 2 years I was injected with this stuff. It used to itch like mad. Around the 2 year mark I noticed I wasn't sneezing nearly as much.
These days I might get 1 or 2 days worth of hayfever, esp if I mow the lawn without a filter mask.
It was well worth the cost of getting the jabs.