Eating under 1000 is WAY to low, especially if you are working out every day. I am guessing that your body has slowed its metabolism (exactly the opposite of what you wanted) because it thinks its starving. Which it kind of is in a way. Its the way the body protects itself.
You can still eat extremely healthy, but higher calories and I am guessing you will see more results then. Try to make sure to get adequate calcium and protein (also carbs and fat) because Ca and Fat are linked in studies to promote weight loss. Drink the milk, eat yogurt and cottage cheese!
Also make sure you drink a lot of water (I believe it is 64 oz normally, and more if you sweat/workout) because your body will function (and drop the pounds) better if you drink the water. Goodluck!
-Also...if you aren't weight training, its a good idea. You might not drop all you wanted for your vacation, but you'll end up looking/feeling better if you do it this way, rather than the way you are dieting now...guaranteed.
Have fun on your vacation! I wish I could go!
haha