This happened to my wife. It was torture for her for the first year. It's been almost 3 years now and she's just barely starting to enjoy food again. Most things taste fairly normal for her, but a few things, like mint, onions, and garlic, (which are in everything, unfortunately for her) are still wretched.
Basically smelling unpleasant orders instead of normal smells once your smell returns.
https://en.m.wikipedia.org/wiki/Parosmia