Is it normal that i puke whenever i feel sad?

people ask me why I'm so skinny I reply its more beautiful to be skinny, my mom asks me to stop losing weight diet which she thinks i'm doing in purpose,but the truth is that i puke for hours when i ever feel sad, first time happened when i was in love with someone (online relation) and i used to feel jealous whenever he replies to other girls, and once i get to know that he calls one of them "babes" so i puked immediately, and then it become a habit whenever i cry on my own of being sad, i got a fever and start to puke.