I had a similar experience when I first tried keto. mark sisson wrote a book that I stumbled onto and he says that it takes a few weeks to transition your metabolism off the sugar addiction. he recommends fasting and being really strict for the "withdrawal" period. couple weeks.

listen to him on rogan if your interested enough to know more. was a great episode.

anyway, I just eat primarily meat meals and don't really think about food anymore. never felt better.