Vertigo to me is about some guy with a lot of problems, entering a club to find some distraction. Being there with the music he doesn't like and the people he didn't want to meet, his head becomes dizzy and he wants to leave when he suddenly sees this girl. And he focuses on her and that finally gives him something he can feel, a fixing point in his dizzy mind. And he feels a tiny bit of salvation.
My $0,02.
