Congratulations! When I did the Optifast thing, it took me 3 weeks to lose that amount, and that was while sticking to it 100% AND exercising at least an hour a day. I must have the slowest metabolism on the planet.
Sorry to hear that the food sucks. I hope you can find some herbs and spices to doctor it up and make it more palatable. It will get easier as you go along. The first week of a diet is always the hardest.