Melette, Agonycat's advice is right on target. I am a yoyo-er and have tried every cuckoo diet out there -- from cabbage soup to your good-ol-everyday low fat starvation diet.
Two years ago, I too tried Atkins as a "diet," rather than a way of eating. I shrunk off 16 lbs in the month before my wedding. I got married on the 9th day of a 15 day cruise to Hawaii. I stopped my "diet" the minute I got on the cruise ship--I figured, the weight is off, now I can gobble up pancakes, french bread, pasta and all the other gummy gunk I could get my teeth around. By the day of my wedding, I needed three gals from the purser's office to stuff me into my [size 14] wedding gown. Buttons popped off the back of the dress and one of the girls broke most of her nails in her valiant but vain attempt to zipper me in.

Something clicked in my head this January. I reread Dr. Atkins' book and I read any other low carb material I could find. One of the things Dr. Atkins says in his most recent book is something to the effect, "Don't live in the past. If you did this plan in 1996, don't expect the same exact path this time around. It is no longer 1996! You are older this time around and there may be more resistance to weight loss due to more time yo yo-ing." [something along those lines--that isn't the exact quote.]
This time around, my weight loss is much slower, but it doesn't matter to me. In fact, I keep thinking the slow steady pace is giving me plenty of time to learn how I will be eating for the rest of my life. Since January, I have lost 13 pounds and went from wearing size 10/12 to a comfortable size 6. Good luck to you and I hope this helped.