For my brother hitting rock bottom came when he lost his job, gf, son, and temporarily his freedom. He really liked his job and had received two promotions in two years. He cried when they let him go (it was very hard for them as well). He then started drinking more. His R at the time was shaky and eventually failed and he lost his son. He ended up in jail for a few months for something he didn't do but all the circumstances were against him.
He came out and continued his behavior...lost another job; almost lost another R. He showed up at my house one day with his two year old; he was drunk and it was 11:00 pm (my H and I got into a huge fight over this). Anyway, he realized that he had put this son in danger that night (driving under the influence with a toddler---along with everything else that happened) and has not had a drink since.
He switched careers, has become more involved in church and with his family and went back to school.