First of all good luck to you....find something to keep you busy, like blurtit! Lol! Maybe try reading or playing a game. Chewing some gum might also help!
How do I get through a 3 day water fast without going insane? I haven't fasted in years, but need to do so now due to an illness. I believe it will cure me. What are some ways to stay motivated?
What exactly are you trying to cure? I doubt it will cure anything serious, but a fasting every now and then will help your overall well-being.
Remember that our ancestors have used fasting as means to spiritual enlightenment. Evidence of which you can find in many religions. Think Lent or Ramadan.
Therefore I suggest you use the time that you're fasting to understand yourself and understand your body. Realize that your average person in the modern day has never experience true hunger. What we experience are CRAVINGS. Use the time to look into meditation: www.kusala.org/udharma4/mpe1-4.html One of my favorite meditation book.
Otherwise keep drinking more water until you're full and it will go away.