So sorry to see you suffer...
Here's my t2t's worth of help.
If you haven't already tried these:
Replenish your beneficial bowel bacteria by taking a supplement of Acidophilus that guarantees at least 2 billion viable organisms per capsule (this should be kept in a refrigerator).
Taking aloe vera juice, a tablespoon three times a day, will also help the good bacteria settle in and aid the healing of your gut lining - which can become damaged, irritated and 'leaky' as a result of Candida overgrowth.
Other supplements that aid this healing process are butyric acid (a fatty acid found in butter) and slippery elm (obtainable from herbalists as powdered bark). Take N-acetyl cysteine (500-1000 mg daily) which boosts your body's production of the amino acid glutathione and has powerful healing effects.
Fighting Candida is a battle you are guaranteed to win, simply by banishing carbohydrates and sugary foods from your diet, and by re-establishing healthy bowel flora with potent natural supplements. Be prepared for some worsening of your symptoms, headaches or nausea, for a day or two - this is a good sign, as it means your body is successfully eliminating large quantities of dead yeast cells and their toxins from your body, and that you're on the road to recovery.
Supplementing with milk thistle will help your liver break down these toxins, as will drinking plenty of water (drink at least two litres a day). You'll soon notice your symptoms disappearing and your 'brain fog' lifting - leaving you free to enjoy all that extra energy!