First, it's a good sign that you have little appetite - it means that it's working.
Ketones, which you release as a byproduct of burning fat and protein as your primary source of fuel, are actually appetite suppressants.
I do think you need to remember, however, that you need to eat. Just portion your meals so that you have more snacks, whether you're hungry or not. A lot of people (myself included) feel that you can really mess up your metabolism if you don't eat enough, leaving you more prone to regaining weight.
Have you actually read the Atkins book (Doctor Atkins New Diet Revolution)? He has more to say about this issue in there.
If you haven't yet read it, you need to. Not like, "you should read the book," more like, "stop everything in your life and read the book
right now before you do anything else." It is extremely important.
Eat at least one salad that has lots of nutrient-rich greens - I don't care that you're taking a good multivitamin - the good multivitamin is supposed to be
in addition to the vegetables. Eat more real food - chicken breasts or beef - and less frankenfoods - sugar free (whatever) or meal replacement shakes. Weigh yourself regularly. Get bloodwork done. Exercise at least a bit.
These things are all basic fundamentals of the plan. Make sure you do them, and make sure you know them by reading the book. There's an audiobook version available if that would be easier for you to use - I re-listen to it during my commute somewhat regularly. You can get it from iTunes or audible.com.
So, basically what I'm saying is - you're doing good, just clean it up a bit and you'll be doing great.
Best of luck-
-j.