So sorry that you have to go through such a challenging time. I don't talk about it much but since you asked I'll try to share. Hope it may help somehow. I lost my brother to alcohol also ending in a coma even though he was in the hospital. Very sad. That is actually one of my motivators to stay sober so I won't put my Mom through that sort of thing again. Don't believe she could bear it twice. My Father was also a recovering alcoholic for most of his life. Lost him to cancer last year but he was sober. Even so, his alcoholism seemed to be a struggle at so many times in his life. It is just a dreadful disease.
I'm glad you had those 10 great years. That is a blessing that so many couples never know. I am very close to my wife and am thankful for each day. Your post reminds me to do that all the more.
I will pray for you as soon as I post this. Peace and Comfort to you.