Ill keep you and your family in prayer Ken. I am I almost the exact same situation. My wife has lupus and its a one income family as well. It's really tough and I have a good understanding of how you feel etc based on my personal experience with my situation.
But we got to keep our head up and continue to believe that God will pull through and continue to provide a way. Easier said that done but we got to be strong for our spouses and just believe.
Keep me in prayer as well.