Jay - Thanks for your input! I can't see another doctor until the beginning of 2011 for insurance reasons, but then hopefully they will be able to figure some stuff out!
And to the OP, I agree with xty about finding a caloric intake that is comfortable/livable for you, and that means not being hungry all the time! As long as you get plenty of protein and enough fat
I'm sure your body is trying to tell you somethiing with all that hunger, you might just have to experiment a little bit to find out what will make it happy.