Not everyone is the same, I was ok until day 6, even then just light headed and a headache. I took 2 asprin and went to bed for 1 hour and woke up feeling great. My next bad day was about day 13 when I felt the same as day 6.
I think water is definatley the key to have starve off some of the symptons.
I was one of the lucky ones who sailed through it I kept glugging down my water!! I never had any of the side affects. Maybe my body just was in so much shock from not being stuffed with rubbish all day it couldnt even produce a headache lol!! Although on day 5 I could have probably eaten my own arm but a litre or so of water cured me.
I had headaches and felt really dizzy, but then chasing around after a toddler will do that to you when you suddenly reduce calories. but by half way through day 4 it was all good and I haven't looked back. I hope you sail through with no side effects.