I'm so sorry to hear that, I will pray for you and your wife.
Although looking after someone with a disability is obviously a difficult task, it probably isn't grounds for divorce, Biblical or otherwise. Did your wife not promise to love you "for better or for worse"?
However, I'm just a teenager, I'm probably not the best person to give advice on the matter as I've no idea of what it's like to be married or to look after a person with a disability.