Clay Boatright knows all too well what a positive mindset can do in the midst of a crisis. In his book, God's Plan, Our Circus, he shares how having a positive mindset got him through discovering his twin daughters had a disability and the passing of his wife to Ovarian Cancer. He now uses his testimony to help other families who face such situations. Having a positive mindset is a very key element in getting through any crisis. Your attitude determines your outcome, as Clay knows all too well. 
If you would like to purchase his book, God's Plan, Our Circus you can find it on Amazon, Barnes and Nobles, or go to his website, https://clayboatright.com/