Why am i not loosing wt while on only shakes??

Iam on 6 NSA CIB shakes in 8 oz of fat fee milk daily , have been doing this since 1/1/09. My surgery date is 2/12 and since i have fatty liver already i figured i would start early to make sure my liver shrinks enough. Well on 1/23 i went to the doctor and got weighed and had not lost a pound. I swear i have not cheated. I do what i am told and why have i not lost any weight. HELP me i need to loose 15 to 20 lbs by 2/11 what am i going to do short of starvation altogether???? PLEASE GIVE ME HELP ASAP no time to loose.please excuse any typos

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