Keep going hunny!! I've only just started, but since 04/23 i've lost 4.5lbs... I can't really see it but I have some nice comment from my family, saying my face is a little thinner, and I don't look so tired (the shadows under my eyes have almost disappeared!!).
Tonight, I'll be taking my first set of progress photos, then doing that every 4 weeks. A lot of people say its a great way of actually tracking your progress. So if you can't really see when you look in the mirror, if you compare it to an older photo I reckon 15lbs would be noticeable.
Keep your head up and don't give in to that little monkey on your back. He'll be gone soon.