Welcome to the forum; I can relate on several levels. AW and I have been married 30 years, the last 5 of which have been overshadowed by her drinking. I can't tell you where the strength to say "enough" comes from, because I'm still looking, myself.
Like you, I'm amazed at some of the stories I read here, and it gives me hope that I'll eventually see my way clear. Until then, there's support for you here and other places.
By the way, I scored 14 on the test.
Best of luck to you.