I have a case of athletes foot also. Fortunately, mine is almost entirely on the soles of my feet. However, I do have it mildly on a few nails. I asked my primary care physician for a prescription of Lamisil tablets. This is supposed to be one of the best treatments available. He said that my insurance insists that a specialist presribes the medication. So the primary doctor gave me a prescription for Nystatin/Triamcinolone cream USP and a referral to a podiatrist.
First, we discussed the Lamisil tablets. The podiatrist told me a couple interesting things. He said that studies show that Lamisil tablets don't work very well when only a few toenails are affected. They work better when all 10 nails look bad and I think I remember that he said the worse they look the better the Lamisil results. Next, he told me that things like Athlete's Foot become resistant to treatments over time just like bacteria become resistant to anti-bacterial soap... So, treatments we used to use are no longer very effective. He suggested to continue with the Nystatin since I had already started. He also used an electronic file to remove the worst affected area of my toe nail. He said to use the cream on the nails as well as the soles of the feet.
A few weeks later I had a follow up visit and the Nystatin hadn't worked well. So, he prescribed Naftin 1% cream. I'm supposed to use this twice a day but have only used it once a day since I'm lazy. That's probably not a good idea. Anyway, the nail that has grown back looks much better. (I wish he would grind down or remove all of my affected toe nails and let them start all over.) The skin is not really any better looking but the slight itchyness is gone and the skin under my small toe that was opened up is now healed. Don't know if that's because I'm drying my feet really well after taking a shower or if it's from the medicine.
Anyway, the nails are really tough to solve but you should see a doctor about this. Don't know if a podiatrist is best. Wouldn't you think a dermatologist would be better?
In the meantime, dry your feet really well. Wear shoes that are ventilated if you can. Wash and dry your feet before putting medicine on...
Most important, address this problem sooner than later. I have a feeling that when the problem looks twice as bad it's actually much more than twice as hard to get rid of it.