I have dancing classes and I have to dance continuously for three songs that equal about 11 minutes of dancing together. I'm a little on the heavier side but not obese. I dance all the time and today while practicing our dances, right after we finished all three songs, my lower right side started hurting really bad. I laid down but it still hurts. I'm still laying down but I don't know why this would happen now. Do you think it might be my appendix? I've never had this since dancing, only this one time.