Hang in there. I know it doesn't seem possible to not lose on this plan, but it does happen. I was completely frustrated with losing less than 3 pounds the entire month of January, and now I'm down over 6 pounds so far in February.
Are you taking measurements? The weeks the scale doesn't move are usually the weeks I'm losing inches.
Keep going - you CAN do this! Like Kaplods said, persevering through the tough times is what separates the quitters from the winners.
Lost the first 100 with Medifast, now working on the last 25