Maybe I can help. My husband and I 'stumbled' onto primal eating, and only discoverd the blueprint later. As such, we were making it up as we went along. We weren't looking for weight loss, though, we were looking for improved health. We found both, in the long run.
Perhaps if you take the focus off weight loss per se, and focussing on eating in ways that make you feel better, it will be easier to stick with it. That way, you can eat in ways that reward you instead of focussing on limitiations and being tempted to "cheat".
An example: sugar isn't great for us, but since we were focused primarily on removing grains from our diet because grains were actively making us ill, my husband and I binged on pseudo promal baked goods for the first many months we ate grain free - we ate almond based cookies, brownies, and pancakes, we ate pie with walnut crusts, we indulged to our hearts delight and said frequently to one another "This is deprivation I can live with!".
No, we didnt lose much weight, but we felt better and better! Over time we found the baked goods less appealing, too, because we used honey, and we reduced the amount each time we made them, reducing their addictive quality.
As we gradually started to focus more and more on meat and vegetables, we did start to lose weight and that was just a bonus because we'd been feeling great for a couple of years at that point.
Even better, we have a treasure trove of "treats" recipes that we can pull out for birthdays and other celebrations, so we get "party food" that doesn't set us too far back.
We've been on this path since late 2009. My husband has lost over 100 pounds and I am down from a size 28 to a size 14. Most of that happened since last November -- but we've felt terrific since late 2009.
Maybe if you could find recipes for treats you like that won't suck you back 9into grain eating, it would be easier to stay strong long enough to start feeling the improved health that is its own reward?