Mind blowing sex

So my fiance and I have sex quite a bit and I always get off more than once.. always the same time he gets off too. Well earlier we had sex and I got off probably six times and the last time was so intense and soooo amazing I became so extremely light headed and couldn't even walk. It was wicked good and just nothing I've ever felt before. Have any of you ladies ever experienced an orgasm so intense you became light headed and couldn't walk after sex?