Butter on bread and toast and I eat eggs whenever I fancy them, I also love cheese!

This might sound irrelevant but I have been suffering from a fungus infection on my right big toenail for years - It's disgusting; half of the nail is black. I suffered from a mild ringworm infection on my thigh two years ago! Thinking back 18 years ago just after I had my first amalgam fillings whilst in the army, I used to suffer from awful bloating! Are these signs of yeast overgrowth?

I don't think I have Candida at the moment, how would I know apart from the fungus in my toenail?