As the others have said...dont give up...17.5lbs over 7 weeks, is an average loss of 2.5lbs, so you are doing brilliantly!
Try and keep your mind away from the fact that you are on a diet, give yourself something to do in your spare time...I go dancing as a break from my everyday life!
Before you know it, you'll be at target thinking what was all that worry over.
Take care.
Kerry-Ann
xx