Extreme dizzy spell and nausea + vomiting

Crystal

It's happened twice. I've been having sex with my boyfriend (I'm on top) then I suddenly get very light headed and dizzy. We stop I get off and I'm hit with intense nausea. Last time I spent 30 minutes in his bathroom beside the toilet. This time I crawled to the bin and immediately started throwing up. Does this happen to anyone else? Should I see a doctor? Is there something wrong with me?