I know how frustrating it can be to feel you have had a setback. I do not have advice for the candida, but I have an idea for shampoo. I found this solution since I react to coconut and all natural shampoo products have coconut in them in some form or fashion. I use the “No-Poo” method. I was skeptical but I have been using this method for two months and I love my hair. I do not have to use any other hair products like setting lotions or sprays. I am sending two links. One will give you give reasons to try it and a method to use and the other is another process to use.
Let me know how you are feeling.