The first thing to do is to cure the Candida. Do whatever it takes but see a holistic doctor, don't try to do it yourself by taking this and that. And the diet alone isn't enough. You can't get well or do anything else with a systemic candida infection.
I developed MCS when I had candida. The candida was cured but I still have MCS though it's mild now. It's just that the smell bothers me and sometimes makes me cough.