@Jessie 107
My nail fungus began two years before my CFS related symptoms emerged, in 2008.
While I was using an over-the-counter topical brush-on liquid (probably undecylenic acid), the fungus didn't worsen, but it also did not get better.
By 2011 I tried convincing my gastroenterologists and others that my fungal infection was caused or related to my gut dysbiosis / my severe IBS symptoms, insisting the whole thing was related.
By 2014 I started taking VSL #3 prescription strength probiotics and nail fungus seem to gradually get better over time.
I have no proof, so taking the probiotics and my nail improvement may have been coincidental.
Then, 3 months ago I stopped taking my probiotics (lactobacillus) for a seven-day trial period, to test out a theory. And by day 7 I noticed my nail fungus had come back with a vengeance.
I restarted the probiotics with lactobacillus and bifidobacterium. After a short period of time where I was physically ill, icky, and experiencing plenty of nausea, my nails and the rest of me got back to “normal.”
Seven weeks ago I was having another issue, and started ingesting high fructose corn syrup in the form of caffeine-free Coca-Cola.
Note: it turns out high fructose corn syrup was the main cause of my severe IBS-d.
I had severe pain and bloating and my nail fungus issue flared up big time within days.
I know and realize this is all circumstantial evidence, but thought you might find it interesting considering the issue you are attempting to resolve.
I'm not sure if simple sugars or high-fructose corn syrup is the cause for your issue, but perhaps this information will help somebody.
Is this a SIBO thing, bacterial overgrowth? Who knows.