Try drinking more water, it can help with the hunger. I also found green tea was good for the first few days - I believe it is fine to drink, I'm sure someone will correct me if not.
As far as I understand Ketosis can take different amounts of time for different people, I know I was definitely in Ketosis by day 6 as that was when my ketostix arrived, but I didn't feel hungry from day 3 so I think that was when it started. Keep strong and you will get there! Hope that helps.