28 yrs, I only say five because out of the 7 i've been consciously 'figthing' it, 2 years worth were times I lost faith and feel back into old way. Can you say you give it your all for twenty whatever years like you proclaim?
If I say i've got it of course it is real, but so is a lot of what we think about and give our emotion to, it becomes a part of us.
You doing crossfit and marathons has you focusing on building, growing and improving more so than 'oh no this candida'. Anyone with candida needs to get seriously active, start a business, start exercise, start doing, doing, doing. This is bringing in, this is growth, this is constructive, a part of your being, this will build you faster than candida can deconstruct you. You go train to do a marathon sub 2hrs 30mins, commit to it, think about it every minute of every day until you have done it and i guarantee, you wont even come here to thank me because you will have completely forgotten about candida.