fret about (someone or something)
To feel anxious or concerned about someone or something. The doctor won't have my test results for a few days, and I'm trying not to fret about it. Don't fret about it—it's really not a big deal.
fret about someone or something
and fret over someone or somethingto worry about someone or something. Please don't fret about being a few minutes late. There is no need to fret over Larry.