Moly helped me with brain fog and dizziness when my candida was at its worst. It also helped my not have pain when I would take MSM(both kidney and bladder pains). It also helped me better tolerate eggs. I had results within a week, 2-3 days, after I started taking it.
If you are reacting to MSM, I'd just drop it. It competes with calcium and potassium, both of which can affect sleep. It can always be added back once other things get balanced.