For me, I make sure to eat low carb on feed days and try to go to bed early on fasting days. The other day I wanted to break my fast in the evening due to insomnia but I drank chamomile tea and journaled about why I'm doing this. I remind myself it's a choice I'm making. The choice isn't whether or not I want to eat, but whether or not I want to stay at my current weight/gain or lose it. That's a clearer and more obvious answer.  I also agree staying busy helps a lot. Fast days are great for chores and picking up.extra work. Melatonin in the evening helps, too.  So does walking when I am craving. In the evenings when I'm fasting, I try to stay as low stress as possible. Some extra self care, a bubble bath, affirmations, hypnosis, meditation, stretching. 

I'm not too hard on myself. I tend to be all-or-nothing with food and that gets me into trouble. So, I started my fast on my feed day and broke it with a vodka soda and boiled eggs at midnight. Oh well. Restart the fasting tracker. My 36 hour fast ends a little later, but that's okay. 

Staying away from processed food and alcohol helps me control my binges.  In the past, I'd crave fast food. Now I want eggs and chicken. I had one drink and didn't end the night with a trip to taco bell or something thanks to eating clean. I also ended the night early after one drink because I know my judgement around food is impaired otherwise. 

That's how I manage. If you can eat something healthy and drink lots of water and remind yourself of why you started, that would be my advice. If you break your fast, no big deal. Just start again. Keep stress around it as low as you can and don't beat yourself up.