i don't think your body is agreeing with the sugar.
an anti-candida diet would be optimal even if only for a few weeks, you can rebalance your flora too with juicing and enzymes.
Also work steadily with boosting your immune system, this way if you do have an allergy or intolerance the immune system can work to fight it off.
echinacea, and medicinal mushrooms, aloe vera juice fresh from the leaf, etc.