Ailidh
I am going to speak frankly here, because I think you can handle it.
I don't think you should weigh yourself every day. It clearly drives you to distraction and upsets you. The truth is... weight loss is not linear. It makes no sense, sometimes. Trying to impose your will on it, or make sense of randomness, is just a recipe for disaster and disappointment. Why subject yourself to this kind of emotional roller coaster?
Now, I am a daily weigher. But, I learned long ago that the scale goes up and down in ways that are seemingly unrelated to my efforts. In fact, adding new, healthy things often cause my weight to spike and/or stall for quite some time. When I started lifting weights this month, I gain FIVE pounds and kept it on for almost a week. Did that upset me? Well, a little, because it was so much... but the weight dropped off eventually and then some. I have learned to accept that the scale is only one measure of my success. In fact, it is the least important one. How I feel, the way my husband looks at me now, the self confidence and pride I gain from sticking to my plan.. these things far outweigh any number on the scale.
I have experienced what you are experiencing, and at at the same place.
Look:
Tuesday 30-Sep-08 202.0
Wednesday 1-Oct-08 202.4
Thursday 2-Oct-08 201.4
Friday 3-Oct-08 202.2
Tuesday 7-Oct-08 201.0
Wednesday 8-Oct-08 202.8
Thursday 9-Oct-08 202.4
Friday 10-Oct-08 201.8
Tuesday 14-Oct-08 202.0
Wednesday 15-Oct-08 199.0
That's two weeks, where the scale basically stayed exactly the same. But, eventually, I lost 3 lbs "overnight" and never went above 200 again. I know this is not what you want to hear, but you need to get over this obsession. It's unhealthy and not helping you. Maybe just take a break from the scale for a few weeks, and focus on eating on plan and exercising. I would bet money if you do that, in two weeks the scale will be below 200.
Take it easy...
Peace, Heather