The reason you are hungrier now is because before your body was starving. When in starvation mode your body kind of turns off the urge to eat, it believes no food is around. When you start giving your body a healthy dose of calories, though, it becomes insatiable. Your body now thinks it is a time of prosperity so it gets greedy with calories, trying to reclaim all the weight it lost. This is the number #1 reason people regain weight after doing something like a 500 cal liquid fast.

I too used to eat only 900 cals a day and then upped it when i stopped losing, i went through the same thing you are now. Just control the urges, they will pass eventually. Keep eating 1300-1400 cals a day, and make sure to get a lot of fat, protein, and stay under 20 carbs.