In the end for me it was my physical dependency (had to drink at work to function) and my physical health that left me no choice. I was covered in bruises, having nose bleeds and being sick all the time (no clotting due to liver damage).
I'm sort of grateful my body gave up because I would have just carried on, I didn't know any other way after 20 years of drinking. I really admire people that recognise and stop before it gets that bad.