I'm not a Doctor but it sounds like you are stressing your body too much and expecting results yesterday. An average person dieting should eat at least 1500 kcals per day or your body will think a famine is happening. Your body will hold on to as much fat a possible because fat is the easiest way to store kcals. You may also be replacing fat with muscle. Muscle weighs 2X is much as fat. Muscle also retains the all-important nutrient water.
A good way to keep sane is to weight yourself once a week and to have an accurate bodyfat test done onces a month.
