Before you start with ALA, you have to clear away most of the candida and other stuff. It's not going to work to chelate if you have too many parasites around, because ALA is a potent parasite and candida killer as well, so there is no way you're gonna tolerate this. As long as you're in a state that you can't tolerate anti-oxidants like C+E vitamins in large amounts, but get foamy salivation and brain fog, you still have too many parasites around. Keep bombarding them with C and E and other more light stuff until they are almost dead, and then you can start thinking about switching to heavy artillery.
I hope you have started a rigorous anti-candida diet as well, it also won't work without it. Also support your adrenals with whatever you find to work.