I've seen the plan and didn't like the look of it at all as its too restrictive.
people I know who have tried it have had a great loss but then after coming off it they've had a slight gain due to the change of eating etc.
I would definitely talk to your consultant for more advice, if you are really struggling why not give success express a try before taking desperate measures with the fast forward plan.
Let me know how you get on. xxxx