My feet are always getting numb, maybe at least 2 times a day?

i still maybe for an hour and every 10 minutes I get up. depending on the day or class I'm in, I may be walking around and standing rather than sitting for all of class so from the info I got from the internet, it says that this happens to people who only sit for a very long time but I'm up and walking and doing activities, physical ones thus I'm not sure why so very often my feet get so numb and I absolutely hate the feeling, makes me wanna vomit. so what's up with me?
My feet are always getting numb, maybe at least 2 times a day?
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