I understand your motivation, because I am the same way, but when I've lost weight that quickly in the past, such as from being sick, my body works really hard to put the weight right back on. The link I posted should help you lose 5 lbs in a week. So hang in there for 2 weeks and you'll get a nice boost that will motivate you for the long run. More than 5 lbs in a week would probably be counterproductive.