I've had a seriously bad fungal infection under my toes…started about 13 years ago and the doc reckoned it was nothing to worry about…each visit he told me it was all fine…then I finally got sent to a foot doc who took some samples and confirmed I had some sort of fungal thing – can't recall the name but it sounds like RubRum in the name) – anyway, I'd tried over the counter creams and had no impact…I was given a course of anti-biotics for 6 months and it did make a big difference…but the upshot was that I managed to loose have my big toe toenails on both feet…the nail is growing back but it isn't attaching – so I've got some real hideous looking big toes now – worse than they used to be!
To top that off, 6 weeks after the antibiotics ended, my middle toes on my left foot went bad…and I've almost lost the nail off that…got another appointment in a week or so time, but I'm hoping for a stronger treatment to give it the final heave-ho.
Saying that, after about 6 weeks of the antibiotics, my itchy feet cleared up and not problems since – feet get washed daily and fresh socks daily – I pad about the house with no shoes on so they get plenty of air (tiled floors downstairs so barefoot is out due to cold!).
Not that this helps at all, but if it doesn't clear up quickly, get to the docs and see about antibiotics to give it a good kicking before it gets a real strong hold…