I agree with Szkuda - losing weight quickly isn't advisable. It won't stay off in the long run, and losing weight quickly isn't healthy.
SW is a great plan, although I realise it doesn't work for everyone. It focuses on keeping you feeling full for longer, and changing your relationship with food. There are lots of tips on the SW pages, or ask for more advice. I've been a member of SW for some years, so there's little I've not seen/heard at group