I had fungus in one of my big toes for about 15 years. During that time I tried strict regimens of both OTC and prescribed topical medications, as well as tea tree oil. Had the nail removed twice so I could get whatever medication onto the infection site, which was at the base of the nail.
Twice the infection appreared to be gone, but later my heart sank as I saw the fungus returning.
Finally I ended up getting a prescription for an antifungal to be taken orally for 90 days. Expensive stuff, about $1000 USD. It did the trick... for three months! I decided to go it again. I got a second prescription, same stuff, thinking it might finish off the fungus 100% this time since it was a smaller infection than the first time. Well it worked... For three years. When I saw the infection returning, I almost cried.
I got online and started searching madly for causes of the fungus. That's when I first learned of the concept of candida, and intuitively felt there was something to it for me. I adhered to a strict diet (Google Candida diet), most importantly NO SUGAR. Worked like a charm; I saw results with my toe in a couple of months.
Over the following ten years fungus reappeared three more times... But at the top of the toenail, whereas before it was the base of the nail. The good news about that was that now I could get a topical medication to it without removing my nail.
The medication I used was bleach. I used the bleach pen, applying a line of it twice a day under the toenail. All three times this killed the fungus within a week. I realize this would not be a popular remedy with naturalists, but stubborn infections call for desperate measures.
Everytime it had appeared I had realized my sugar consumption had gradually increased over time, resulting in another fungus outbreak. So along with the bleach, I also cut out sugar during the treatment phase.
Finally I accepted that I am more sensitive to sugar than most people, and adopted a low sugar diet as a lifestyle.
I have been fungi-free for four years now! My toenail looks normal, as if it had never suffered 15 years of infection.
Hang in there! You have no choice but to be patient with the process, and you too will soon be fungi-free.