Please note that nuts (and I believe seeds as well) are not on the anti-candida diet because they attract mold, and mold feeds the yeast.
I noticed that mostly following the diet while sometimes or often cheating on it can actually make a person feel worse and increase some symptoms compared with not following it at all. I'm not sure why, but perhaps the yeast stops getting enough food, so it starts overreacting when it does. This could be the cause of your belly getting bigger.
To test this idea you could try avoiding nuts, seeds and any other controversial foods on the diet (carrots, for example). Do this for a week and see how you feel.