Hi PKR.
Firstly, well done on a brilliant first loss, that is really amazing. The physical effects of the diet are certainly at their worst during the first week when you're heading into ketosis. By 3 weeks, ketosis should be established enough for you to have the bars, mousse and water flavourings which help a lot of people stay on the straight and narrow.
In my opinion, the diet only becomes hard mentally and emotionally. Many of us here have problems with food- be it binge eating disorder, comfort eating or something else, it can be a hard time to go from eating what you want to very little at all. You WILL crave something, you WILL feel hungry at times, but your body doesn't need what you are craving, it is all in your head!
Your mindset toward the diet can be all that dictates whether you succeed or fail. I read a post a while back by Icemoose, who has done amazingly well on CD and is now a CDC. It basically said "remember, you have CHOSEN to do CD, whatever your reasons were, I'm sure they were good ones. Don't think of CD as a prison, somewhere you are trapped without food and enjoyment for months, think of it as the key to real freedom..... cause that is what it can give you"
There are some fantastically supportive and motivational posts on this forum, so if you have a weak moment, come here and have a browse. The inspirational pictures are amazing and can really help you remember why you are here. Hope this helps a bit xx