Sounds like you're like me - all or nothing. I just recently started eating this way, and the only thing that worked was getting into it gradually. I started just using all whole grains instead of the white processed stuff. And instead of focusing on what I couldn't have, I focused on adding good stuff to my regular diet. After that was down, then I focused on taking out the bad stuff, especially sugar. I had one bad day, where my head was in a complete fog, I couldn't think, and I had a headache, but since then I've felt GREAT! Now I don't even crave junk. Like 2 days ago, my DH wanted me to make cinnamon rolls. I did, and I never even touched them! It was like they weren't even tempting! (that, for me, is miraculous).
So I guess I would say, don't start off demanding perfect clean eating. Do it gradually, focus on the positive foods you're adding to your diet instead of what you need to take away, and tell yourself that YOU CAN DO IT! Also, if you don't have it already, the book BFFM helped me tremendously with my motivation. Hope this helps, and don't wait till tomorrow. Start with your next bite of food!
Dani