Had my second fill today

I went today for my second fill. I was pleasantly surprised because the doctor I ended up seeing was not the doc I expected. You see, they are a father/son team, and last time, guessing by age, I thought I saw the father, so that's who I made the followup appt with. Well, today I met the father, and found out that last time I had seen his son. Anyway, he gave me another 1 cc. He also prescribed Phentermine which he said would take away any cravings that I may have, and told me to eat a modified Atkin's diet, essentially only eating meat. He does not want me making my protien shakes with milk, only Water or crystal light or something like that.

He said he wants me to be dropping 20 lbs a month. Does this seem exteme to anyone? I'm going along with it because he is a doctor after all, and he has tons of experience with the band -- telling me that he actually did the first LapBand surgery in the US 11 years ago.