I'm A 42 Yr Old Female. My Left Foot Is

I'm a 42 yr old female. My left foot is itchy, with blisters between my toes. If my foot is kept cool, it is better, if my foot gets warm it gets more itchy. The ER DR said that it wasn't athletes foot and prescribed kenalog cream, that just makes it worse. I've tried everything from dog washes, otc creams, bleach, cream of tarter, oatmeal baths, etc. Nothing seems to be working. Please advise me if possible. Thank you, Krista