Try not to let it get you down Purple Patsy. I agree with EmmyR1984 with regards to water. Even if you can't manage any breakfast you should try to have a glass of water at least.
Also, you might be doing it already but you should always try to weigh yourself at the same time of day, in the same condition. For example, I always weigh myself right after getting up on a Tuesday morning before I eat or drink anything. After all, 1 litre of fresh water weighs 1kg (2.2lbs) so you'll put on over a pound just by drinking a pint. If you weigh yourself at night can you guarantee that you've drank/eaten exactly the same amount as last week? Just for fun, try weighing yourself tomorrow morning to see how much difference there is.
Anyhoo, keep on smiling, keep your diary (might even be an idea to start a thread in the appropriate section on here) and good luck with the next week.
Kev