Don't get discouraged Peg. Learn from the week and grow from the experience. Remember this new lifestyle isn't going to hatch overnight!
Check your two levels of control. Am I making healthy food choices and are my portion sizes correct? Am I pushing my fitness level are just cruise at a comfortable routine level? When we start out the shock to the body of dietary and exercise changes give good results...then the body learns how to deal with the change so we always have to up the ante and keep the body pacing to our tune.
Keep your head and make sure good changes and the results will come.