I found the first time I stopped eating sugar, it was easy, three days and I was done.  I've let it creep back in while travelling and found the addiction harder to get rid of the second time.  I just ate dextrose sweets more than usual to keep myself happy while I was withdrawing from sugar and felt I was struggling to 'just say no' to having a treat.  I think everyone is different, but I do feel sure that it's normal for your appetite control to take a while to kick in when you're withdrawing, especially the second time.  I would recommend buying some nuts or similar to snack on during this time, just to get you through it.  Have no sugar in the house, you can't eat what's not there.