I used to have ear infections a lot; and most times it would settle in my right ear. Consequently I have lost some very high frequencies in my right ear. Things like a TV screen that emit really high frequencies I can't hear in my right ear.
Whenever I'm doing a mix in studio, I wear the headphones backward for a couple passes through the song to make sure I haven't overdone the highs on the right side.

That's really a bummer though when you've taken care of what you expose your ears to, and then something totally out of your control like multiple infections rob some from you. I'm just glad it has only affected the really high frequencies in one ear.