When it lasts this long, there is an underlying condition at the root of candida; the candida itself is only a consequence.
Have you tried probiotics under different forms?
Pills make me sick as a dog; can't touch them. I can't have yogurt or even kefir--allergic to dairy. The only probiotic I can tolerate is lacto-fermented sauerkraut, in small doses, due to intestinal gas.
In Europe, I have seen bio soups and soja milk, even butter, enriched with bifidus. Check if those are available in the US.
Hope it helps.