First, congrats on your first week!
One thing that you SHOULD NOT do if you will obsess about the numbers is weigh every day. You may see the scale at a standstill for days and then POOF on weigh in you'll be missing a few pounds. Until you get into a rhythm with the program, put the scale away and save the weighing for your clinic!
Also, as someone else mentioned the 2nd week can often be a lower loss week when you have a big drop in your first week. Your body has to adjust to the sudden loss. You may actually see a change in your measurements instead of on the scale - it's all normal
And as far as the anxiety/emotions go - when you lose fat you release estrogen into your system. So if those are normal symptoms for your TOM, then they will also show up periodically as you lose weight and let go of the estrogen that was storing in your fat cells.
Good luck!