Parsomia after covid

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so my girlfriend had covid and now after she got her sense of smell back she says that almost everything smells rotten and like sewer.
Doc says that this isn't a permanent condition but it's driving her insane.
Anyone else here who had the same issues?
If yes how long did it take for you to be cured from this parsomia?
Is there any cure or good treatment for that?
It's been like that for 2 months now.