Why do I get a warm feeling in my left foot that comes and goes should I be worried about it it comes and goes the outer part will be cold to touch but inner part is were I get the warm feeling should I be worried

You may have. A pinched nerve either locally or more proximally, as far back as your back. Emg/ncv testing may be helpful.
Please. Please provide more information such as age, any medical conditions such as diabetes, and other problems such as back pain. How long have you had these problems and how much do they interfere with your activities of daily living?