I don't know if anyone can answer that question, but I would like to suggest that you speak to your doctor about following the Atkins diet if you haven't already. Studies have shown a strong connection between depression and very low carb diets, and it's not recommended that anyone prone to clinical depression follow this type of diet plan.
Like any other diet plan, there isn't a one size fits all solution. Atkins and similar plans work very well for some people, but they aren't for everyone. Please discuss this with your doctor. If she says the Atkins plan is fine for you to follow, then she will also know if the medications will have an effect on your weight loss as well. Some medications do make it a little more difficult to lose weight, but not impossible. Usually extra exercise makes up for a any changes to metabolism.