Open Question: HELP!!! My diet is not working!!!?

I am a 5'5 female, and i weigh around 106-107 pounds. I am trying so hard to lose weight. Everyday I eat: one serving (1 cup) of special k cereal with less than 1/2 cup milk 3/4 of a fiber bar a medium apple the smallest amount of dinner i can get away with why am i not losing weight? sometimes the scale says i am getting heavier! what should i do?