Two days ago (Saturday night) I started burping and every time i burped my mid left back hurt everytime i burped.. It's monday now, and i'm still burping/belching every fifteen minutes or so, and it still hurts. I'm seventeen year old girl(eighteen in a couple of days)... this is the first time i've felt this...it's annoying and i'm concerned.. what is this? what's going on? is this normal??