I have read many of the comments, many were commendable and give the correct advice, which is to fulfill your marital vows "unto death do you part." Others gave frankly bad advice, basically telling you to "take care of number one" (I copied you on my reply to a particularly egregious post of this sort). I can certainly empathize with the problems and crises that you must endure on a daily basis. Thankfully, in my case my wife does have "good days" where we can enjoy each other's company and do fun things together. Often with a smile she will communicate her love for me.
I second the many comments that encourage you to look to God for help. This has been key for me - for both of us as we go through this together. I have experienced countless little miracles where the Lord helped us in a very real way.
Also, I believe that God gives us what each of us needs for our own spiritual growth. In my case, I doubt I would have learned patience and true, selfless love, or how to really trust in God if I had not gone through the struggles with my wife.
Wishing you all the best and remember to "call on the name of the Lord" for help.