But they have said I have to lose 3 stone by the first of July for the operation, and am so worried that if I don't they will send me away xx
DON'T do anything different to what your team has given you to do!! Any change in diet from what they give you can put your chance of the operation at risk!
As rightly said above, the milk diet is NOT for losing weight, it's for shrinking the liver. It's NEVER given to people to lose weight. Losing weight from SOME people is just a secondary action!