Why Is It So Hard...

So I started this goal a few months ago to try to lose weight before my trip to Japan.  I have between 4 to 6 pounds to go and I will reach my goal however I am struggling with it.  I'm starting to pander.  I don't quite know why but it's almost this unattainable goal and though I am extremely close I find my body and mind are not wanting to cooperate with me and my goal.  It's almost like I am purposely doing this and in a way I guess that I am but I so don't want to.  I know for a fact that I can lose 4-6 pounds in 6 weeks.  I just need to keep on track.  I also slightly wonder if I hit my first plateau but then again I haven't been the best the last couple of weeks.  Who knows.  I need to find another way to find motivation to keep me going in the right direction!!  What to do, What to do?  I'll figure it out I guess.