With no insult to anyone, I'd personally suggest visiting an ENT and having your hearing checked. I don't doubt that the whistle may have caused some issues, but there may be other issues as well. Let the Doctor run the appropriate tests. In fact, to do a proper test you might want to get tested before the season begins, and again after the season.
I'm not a doctor, but it is possible that he will find another issue that has contributed to your hearing loss. He may even be able to correct the problem.
Anyway, just my 2 cents.
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