My husband was in the same boat as you not too long ago. If I'm taking what you're saying the right way, I think your main problem is that you're not taking in ENOUGH calories. I don't know what the figures are...I'm sure someone around here will be able to tell you *S*, but...you've got to take in over so many calories...at a guess I'd say it has to be at least 1200 calories...and that's to LOSE weight, not even to maintain. If all you're eating is toast, yogurt, rice cakes and salad...that little...there's no WAY you're getting near enough of what you need. I'm not going to tell you what you should be doing, but no matter how much weight you want to lose, you NEED to eat more than that. Your body will think it's being starved otherwise, and hold on to whatever it has in its stores to use. I'd bet you almost anything if you upped your caloric intake to whatever it should be...at least 1200 though...even if it's those supplement bars or shakes or whatever...you'd see that you'd be losing...maybe a bit...maybe a lot. That I don't know...depends on your body, what you're eating, and how active you are.
I know it sounds strange to say eat more, but...from what I've seen, if you eat next to nothing...that's what you need to do...eat more....don't deprive yourself, and definately don't deprive your body!
Hope this is of some help *S*