Both caffeine and Sugar will exhaust already fatigued adrenals. Caffeine really puts the adrenals in the overdrive and Sugar is a double whammy since it will worsen your candida which will adversely affect your adrenal functions. IsoCort will help the adrenals to heal since IsoCort will give you the energy you need. I would probably take Fungal Defense for candida and start the IsoCort. I may switch from coffee to green tea to ease out of caffeine. Of course, Sugar is a big no no, and I have a feeling your fatigue is partly due to your blood sugar fluctuation being caused by your sugar intake. Candida could be the sole cause of your adrenal problem. I would concentrate on cleaning candida up while giving support for the adrenals like IsoCort.
IsoCort has truly been a great asset in my recovery.