Be careful of what your head is telling you. It can play tricks on you! You should live your life from inside your body with the help of your head, not the other way around. So start with descending in your body and feeling what your body feels. This works for any feeling: ILL (wait till it passes/ do the right thing to cure this)+(ill can be stress, pain, resentment,tired,flu,angry, etc.), HUNGRY (eat), FULL (stop eating), HAPPY (just feel it, don't add anything don't take away anything, you are at the right place just stay in the moment).
Your head is just a help to chose healthy foods over unhealthy ones.
I am understanding these things for myself. I did not complete a full water fast but I am moving in that direction step by step. I am retraining myself to do what feels right in the here and the now. This can never let me down. Forcing things can bring injury.
I'll eventually get to a perfect state(lol)