I'm doing the CS diet too. I only had headaches on the first day but now I'm on day 5, i'm feeling great!
I used to wake up feeling yuck from all the food in my stomach from the day before but I feel much lighter and actually feel like breakfast now.
I've lost 1.8kilos so far. (I know I should be weighing myself once a week but I couldn't resist! I'm so impatient!)
I have found this the easiest diet to stick to becuase you don't have to think about food and calories etc, its there, you mix it, drink it and you're done! Also, everytime I want to be naughty, I just think to myself how much I am spending on the shakes and don't want to waste my money if i'm not gonna stick to it.
I'm here if you want to chat