Chris's suggestions are right on target.
It may be that your overall goal of 50lbs gets a little overwhelming. Really, isn't the goal to be fit and health? So rather than using the scale as your measurement, how about good habit goal like Chris suggested: water, walking, using the stairs, clearing out the junk food from the house, that sort of thing. And maybe put the scale away for a while.
PS never mind the title. Fitday decided to post before I had completed the thought. It should say:
2.5 years, 45 pounds later... 128ish pounds