I lost nearly 40 pounds using CW calorie-counting methodology. But, it turned into a huge issue when I developed some disordered eating habits. (I have vivid memories of cutting 1/3 of an almond to make sure I hit exactly 1 oz of nuts for my 10am snack. I'd stare at the clock like a horse chomping at the bit to finally eat my next mini-meal. It wasn't a good point in my life.)
I was hesitant to jump into Primal or Paleo because I was scared I'd get obsessed and end up unhealthy-minded again. Even now, I still find my mind drifting and worrying, but luckily I have learned to tame it. Hell, my "dinner" last night was buffalo chicken dip with corn tortilla chips, guacamole, and some cookies because I was at a party and there was literally nothing else to eat but junk. In my old dietary ways, I'd be freaking out and want to purge it all, but I now don't strive for perfection and learn from whatever slips I make. Like someone already said, you don't go to Primal Hell for screwing up once in a while.
However, I don't blame CW on how I got all screwed up in the head; similarly, I don't think the OP should blame Primal or the PB on developing an eating disorder. These things are deep in the psyche, not the fault of a diet or trend.