How long have you been on the fast? Always listen to your body, and if you just started the fast and are tired you may be throwing off toxins and really starting to heal, or if youve been on it for a while,you may be at a point where you need to eat and your body is yelling at you?
Im new to this and am reading everything i can get my hands on, i just hope that i can decipher what my body is trying to tell me, right now i think it is still in shock from not having chocolate :)