Sounds like a classic case of candida overgrowth to me, and very similar to what I experienced for years. As for you not having any die off symptoms from antifungals, try putting 5-10 drops of oil of oregano under your tongue and letting it absorb. Judging from your symptoms, if you don't start getting drowsy and woozy after the oregano (which is a very potent antifungal), I would be very surprised.
Also, the most important question, did you take Antibiotics leading up to this? As you will read here Antibiotics is almost always the culprit.
Finally, the following have worked wonders for me: Miracle-Mineral-Supplement (amazing), Candex on a very empty stomach 2x/day; homemade kefir from organic cow's milk; and Hulda Clark 's Liver Flush (brought my brain fog from a nine on a scale of 1-10 down to a two or three after only one flush).