You have the wrong idea on the kind of diet you should do when fighting candida. Even though the bread is gluten free, it should be grain free as well because grains can feed candida. Barley, soybeans, spelt, wheat gluten all should not be eaten on the diet. This diet is more than a gluten free diet.
Pork and beef should not be eaten on the diet because it takes as long as 2 days to fully digest these types of meats. Chicken and fish only take hours to digest in comparison.
If you look at the nutritional properties of rice, it is rather high in starch. It also is inflammatory which isn’t good to have if you have an inflamed gut. Rice also ferments in the gut for most people who have candida and isn’t digested very well.
It sounds like you are experiencing die-off and molybdenum amino acid chelate can help reduce it as well as the headaches. There are other supplements such as milk thistle that can reduce the load on your liver.