My advice (for what it's worth) is to keep drinking water/black coffee/black tea and keep yourself busy. The first week went alright for me, but the second week was a killer (don't be put off - we're all different and it affects us in different ways, like I haven't had any headaches at all). Another thing is don't watch too much telly - I watched a whole day of 'Man vs Food' (I know...absolutely stupid) and, although it didn't seem to bother me at the time, the more I watched, the more hungry I got (probably why week 2 was bad). Everything on telly is geared towards us eating, even when we're not hungry. We need to get out of the mindset that when we do a certain thing we should eat - to watch a film we must have a pizza, or if we go out to watch a film, we must have a hotdog, popcorn and a massive drink.