To gain back muscular weight use magnesium.... but not the capsule. Candida inpairs assimilation and liquid assimilates better. Buy the chloride magnesium solution (The taste could be better: BEURK! It tastes much better diluted in a full glass of water).
Brown rice flour you could use in any of your usual recipes.
I use buckwheat instead of flour in my recipes, but for cakes and cookies, I need to put a bit more soda so as to compensate.
Millet is also a good idea: cook as rice .
Did you get your thyroid checked??? Not a bad idea as it is very common that the thyroid behaves is association with candida.
Potatoes are a NO NO on the candida diet. Stay away from them. Sweet potatoes are okay though.