A 25-year-old married woman explains to the PMHNP that she spends an inordinate amount of time tweezing her eyebrows every evening. She says she has anxiety when she looks in the mirror and sees asymmetry in her eyebrows. She tries to pull every hair that is out of place. This can take more than an hour each evening, and it is becoming problematic because she is still unhappy after tweezing. She only stops when her husband demands it, after telling her how beautiful she is and that the asymmetry is "all in her head." She still feels an urge to tweeze her eyebrows every night in an attempt to "fix" them. What diagnosis is the most appropriate?