Your block is beautiful! I was having the same trouble as you. My husband was noticing all of the different things I was "making." He "put his foot down," and said there would be no more fabric bought until I actually finished something!
My best answer was to just tell yourself every day what you are going to do in quilting today, then DO IT! Then at the end of a week, re-evaluate. Just keep doing it, and it will hopefully get you past this hump you have reached. It helped me.
Mariah.