I am the same way. I am not hungry a lot of the time and have to push myself to eat. I always be sure to get in my protiens, but skip on fruits most the time, and sometimes one of my veggies too. My book says is it fine to not do all of the 500 or to skip things in the case you are not hungry. I am trying to watch this though because my weight gain is mainly due to the fact I have no issues going a day or two without eating and then I store eveything I eventually do eat. I really wrecked my metabolism that way. I never tend to be all that hungry and I have never been a big eater.
I would try to get away from the apples just for a few days to see if it makes a difference. If they are a little bit of a crutch or comfort to you I wouldn't ditch them all together since you might be more inclined to cheat on something much worse!
I personally seem to be extra sensitive to the higher carb things we can have though (mostly apples and tomatoes are another one I have to be careful with). I figure maybe it has something to do with the fact that I also have gestational diabetes when pregnant so maybe I just don't handle sugar well.
Water is my other issue. I will do great getting my 2-3 liters in (I usually do not drink much of anything). Those days I lose great. Then I slack on getting my water down and that is another thing that stalls me pretty badly.
Lastly, how tall are you? Could you be getting close to a healthy weight? HCG should quit working at a healthy weight. Sometimes there is a bit of a difference on where you think you should be and where your body thinks it should be.