Hey Abz
I know you are getting ideas thrown at you, but I agree with Ditz, how bout low GI. Im with you on the cost factor with things like atkins, south beach etc. For me, it has to be able to fit in with my family too. I have realised that i have developed a sensitivity to wheat, especially white, so am trying to avoid it as much as possible. I now make my own rye and spelt brown bread, and use spelt pasta. What Im saying is that you can introduce complex carbs, as in GI. Maybe tricking your body with something like the johnsons up down days is what your body needs. It sounds like it needs tricking!!!!!
Hugs to you anyway, you are so good to keep going cause you do seem to have a bod that doesnt want to give in easily!!! lol.
xx