Oh , I do have a tip that works all the time during fasting..........
Think on good thoughts that's going to lift your spirits up. Any bad or discouraging thoughts that try to creep in your mind, cast them down immediately, meaning don't meditate on them this can lead to a frustrated/disappointed time during fasts, this is not good.
Watch clean comedy that makes you laugh, read books to start changing your mindset from your old eatting habbits. This will give you a new focus...
If someone do you wrong or someting happens bad, Learn to forgive quick, hold no grudges, take a moment , and a deep breath and release that incident or purpose out of your thinking, and this will prevent stress build -up.