I think it's more than being annoyed. She says she walks on eggshells and can't focus at work because she worries that he will become mad about something when she goes home. She also is afraid of his reaction if she goes somewhere and does something. It doesn't mean she is afraid of physical assault but she is still experience lots of anxiety and fear over his behavior and his reactions to something he perceives she does wrong. She is afraid to tell him what she feels. It's more than annoyance.