beside oneself with A, the US denied her a green card

This New York doctor who's been treating coronavirus patients says she's still reeling days after getting a devastating letter: Her green card application was denied. "I'm honestly beside myself. It's like a slap in the face."

CNN.COM

While she treated coronavirus patients, the US denied her a green card

beside oneself with A

1. Ａ（怒り・喜び・心配など）で我を忘れて
   • She was beside herself with anger.
   • 彼女は怒りで逆上した

   
   
2. to lose one's mind―to be beside oneself発音を聞く例文帳に追加

   本心を失う - 斎藤和英大辞典

   to be beside oneself発音を聞く例文帳に追加

   魂も身に添わぬ - 斎藤和英大辞典

   （嬉しくてなら）to be beside oneself with joy―in raptures―in ecstasies―（悲しくてなら）―beside oneself with grief発音を聞く例文帳に追加

   魂も身に添わぬ - 斎藤和英大辞典

   to forget oneself―lose oneself （in admiration）―be lost （in admiration）―be absorbed （in study）―be engrossed （in one's business）―be beside oneself （with joy or grief）発音を聞く例文帳に追加

   我れを忘れる - 斎藤和英大辞典