Why Won't My Body Cooperate?

I'm doing everything right. Thought the carbs (like watermelon, broccoli and lettuce) were causing slow weight loss. Eliminated them (on the advice of NUT), lost 5 lbs in a week, then...STALL.

All my life, I have had a hard time losing weight. Even at 17, when my Dr. put me on a 1,000 calorie diabetic diet (I don't and never had diabetes) the weight would not come off till I eliminated most food groups, and ate less than 500 calories per day. I also walked at least 2 hours per day.

Now I have a Protein shake in the morning-17 gms protein, 100 cals

lots of Water and Crystal Light

Lunch-1/4-1/3 cup of some kind of lean protein food

more water and Crystal Light

dinner 1/4-1/3 cup of lean protein food.

More water and Crystal Light

How am I not dropping massive poundage?? Or at least a steady weight loss. I physically can't eat more or more often.

I rarely sit still, for long, either. Walking, household chores, hiking, Zumba, etc...

BTW, I feel awesome!! Amazing energy. This was also the case, during my phases, in the past, of eating less than 500 cals/day.

What happened to if you burn more calories than you take in, then you lose weight?

Any advice, things that my doc should check, etc...?