just to add to Haunted Devil's interpretation, the poison could literally be alchol, like when you get drunk and you suddenly get really depressed and think everything you are is shit.
as for the "tension" and "shaking at the mention" should there be tension from teh fact she is drinking so much and they both know that it is an issue but are afraid to talk about it (the "shudder at the mention"
just to add to Haunted Devil's interpretation, the poison could literally be alchol, like when you get drunk and you suddenly get really depressed and think everything you are is shit.
as for the "tension" and "shaking at the mention" should there be tension from teh fact she is drinking so much and they both know that it is an issue but are afraid to talk about it (the "shudder at the mention"