I really like the tips that "iminhere" gave you. All great ones for minimizing water gain etc.
I think you have to be realistic in a sense that weight loss is not linear. How much do you weigh currently? You might be eating too little for your size but really... two weeks of that is NOT going to send your body into starvation mode (which I'm not a big fan as touting for a reason one is not losing weight.)
What are your macro's? (levels of fat, protein, carbs)
Why don't you post your food plan here and we'll see what we can do!
But for example: last week I lost almost 5 lbs. Sunday morning I was 301. Monday morning I was 303. This morning I was 302.6. I currently have my period so my weight is bouncing all over. In a few days all of this water weight will come off and I'll be at my real weight. I don't let it throw me off plan or upset me. It is what it is. And if you stick to your plan and if it's a realistic one for your body, the weight will come off!
On my own personal journey I started on September 27, 2008
Starting weight 377, Weight in spring of 2010 198, Weight in August 2011? In the 240's.
Still plugging along on this weight loss highway!