I am hypothyroid and have adrenal fatigue. Yes like you I have tried a lot for candida without hardly putting a dent in it. I know it seems the best cures are the basic cheapest things we can do. The first major step to healing is REDUCE STRESS!.
I have found meditation or whatever your find quiets your mind helps reduce the load on body whatever your illness. And it should be done several times a day. This actually helped my AF significantly. Castor oil Liver Flushes really killed off my candida but you can't do that everyday. The thing that help the most was homemade kefir and Kombucha. I do take some pill form of proabotics along with my kefir. In additon I take B complex vitamins several times a day. They also are a big big help. They don't call them the stress vitamins for nothing.