It is both amazing and heartbreaking how the stories of the progression of alcoholism are often so similar.
Witnessing the seizure and withdrawal was so traumatic for me that I organized an intervention, in which my AH spent 2 weeks in rehab (and was clearly not ready to quit). He relapsed within a week and we had another intervention. He then spent 1 month at an excellent (and very expensive) rehab and then began drinking again soon after returning home. By then I had done a lot of research on alcoholism, and understood the power of denial and the deep physiological addiction. I realized that if I didn't leave him, I would only enable him, and he would continue to drink.
I have been living apart from my xAH for almost a year now and I'm so grateful for the peace and calm in my life now. It sounds like you are well on your way in that direction too.