sudden moments of feeling dizzy and heat flashes with it?

I have lately been having sudden heat flashes along with feelign very dizzy and of coarse nautious. I am 21 and as far as i know i am healthy. I eat healthy (fruits and veggies) I have a 6 month old son/ the onyl diseases tht run in my family is cancer and scoliosis. Any ideas why i am having this happen sudeenly? it happens on the computer, playign games, right before bed, in the shower, in the pool or even on a walk with the dog and baby.
 
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