Just started Medifast on Fri

I thought since I am waiting I want to lose as much weight before surgery.Every little bit helps.So far in three days have lost 4 lbs.Hopefully it keeps coming off.The first three days are hard they say.This is day three.I have had headaches off and on..lol..food withdraw..hehehe.I can lose weight but keeping it off is sooooooooo hard.Is anyone out there that is following some program if so what.Let me know how its going.Just think before long we will have our surgery and our new lives will begin.cant wait!!!.