Topical Antifungal. Most fungal infections of the feet respond well to antifungal creams, many of which you can pick up over the counter (ask your pharmacist to show you where to find them). Apply twice daily to clean and dry skin.
Lots of OTC choices. Athlete's foot is a fungal infection of the feet. Symptoms include itching and burning, especially between the toes. There are lots of over-the-counter sprays and creams that are effective for treating this. I would start with one of the sprays. Make sure to spray inside your shoes as well to kill the fungus living there so you don't re-infect your feet.