You were right to be happy and your nutritionist is kind of awful for freaking out. Stalls are normal. Look at how many people on this board are in the exact same boat as you are (most of them at 3 weeks). Take a deep breath everyone, it is going to get better and better and in a year you're going to laugh about how worried you were at three weeks out! I know that it's scary to hit a stall but I can offer a little advice... walk. I know that exercising can be hard, after my surgery I joined a gym and pushed myself so hard that one day I almost passed out and had to take several days off. What I learned that worked for me was to gauge my energy level day by day and on the days that I didn't feel like moving as much, I walked around the track at the gym once or twice. Also, if you possibly can, start working out your core now. Planking works best for me. It will help tighten the loose skin and help you feel stronger. You will be amazed what a very little bit of movement will do for the weight loss. And most importantly, do not be hard on yourselves because you are at a stalling point. You are doing wonderful. You are going to do even better.