Ladybug...it's not just the total calories, fat grams, etc...that we need to see; it's the actual foods that make up those totals. Some foods are known to be problems and I think it would be helpful if you posted an average day's menu so that others can take a look and hopefully spot any potential problems.
Some medications make it difficult (not impossible) to lose weight. I think Zuleikaa may be onto something about those that have difficulty losing weight during the winter months; I have that same problem myself. I haven't lost more than a couple of pounds since last fall, but I know from past experience that it will pick up again once the days start getting longer and warmer. Adding the medication on top of that would only compound the problem; at least it certainly would for me.
I don't have any suggestions for a change in medication. Perhaps you can check the Atkins website www.atkinscenter.com for a suggestion there?