Now...just a thought. Calorie calculators, good ones, often come up with the correct number. If you "shave numbers off", you're messin' with the system. That's why I wonder if you are eating enough. You might be! I don't know. But it's a thought.
I would be so, so hungry if I went 12 hours without eating. I think if you are in the habit of doing this, it's easy to continue, but you might want to think about trying to incorporate some snacks, just to rev up your metablism.
If you aren't peeing a lot, you need more water. I know everyone says your body will adjust - mine has yet to - but if you are drinking lots of water, you should be hitting the ladies' room a lot, and your pee should be the colour of light straw. Not clear (too much water in that case) but not dark at all.
If you are "hardly eating" anything, that's a problem. I am not trying to trick you into gaining weight. You really need to eat to lose. Eat the right things, and eat enough of them, and track it, and the weight should shift. I'm not saying you need to eat 1600 calories, but maybe go along with the number you found that would help you lose about a pound a week.
Good luck