That's what I have just found at some Nick's site:
About the Song
About: A bad mood
A lyrically enigmatic Stevie contribution, with a guitar solo by Lindsey that’s reminiscent of “The Chain,” this was a surprise addition to the set on the band’s spectacularly successful 2014/15 reunion tour.
Stevie: “I honestly don’t know what the hell this song is about. I’ve been singing it on tour for the last two and a half years, and every time I’m thinking, What the hell is that? I think it was me putting up an alter ego or something, the dark lady in the corner, and there’s a Gemini twin thing. It wasn’t a love song; it wasn’t written about a man, or anything precious. It was just about a feeling I might have had over a couple days, going inward in my gnarly trollness. Makes no sense. Perfect for this record!”
But in another Interview she said that this song is also about the situation when she looked in the mirror and spotted herself as a very thin and almost dying person, here's a part of her comment: “I walked out in front of a mirror and looked at myself,” Nicks said during a 1979 radio interview with Jim Ladd. “And I was sick. I went, ‘Oh, poor sad little thing. She must be dying.'”
Yeah, her both bad physical and mental conditions were because of hardship of touring and she even didn't sleep and eat much.
That's what I have just found at some Nick's site: About the Song About: A bad mood
A lyrically enigmatic Stevie contribution, with a guitar solo by Lindsey that’s reminiscent of “The Chain,” this was a surprise addition to the set on the band’s spectacularly successful 2014/15 reunion tour.
Stevie: “I honestly don’t know what the hell this song is about. I’ve been singing it on tour for the last two and a half years, and every time I’m thinking, What the hell is that? I think it was me putting up an alter ego or something, the dark lady in the corner, and there’s a Gemini twin thing. It wasn’t a love song; it wasn’t written about a man, or anything precious. It was just about a feeling I might have had over a couple days, going inward in my gnarly trollness. Makes no sense. Perfect for this record!”
But in another Interview she said that this song is also about the situation when she looked in the mirror and spotted herself as a very thin and almost dying person, here's a part of her comment: “I walked out in front of a mirror and looked at myself,” Nicks said during a 1979 radio interview with Jim Ladd. “And I was sick. I went, ‘Oh, poor sad little thing. She must be dying.'” Yeah, her both bad physical and mental conditions were because of hardship of touring and she even didn't sleep and eat much.