My best friends daughter keeps having leg pain after throwing up. Its completely random, but frequent. She will be playing around and then just throw up without warning and then complain her legs hurt and can't walk. There is no fever or other symptoms than those two, shes tried taking her to her doctors numerous times and keep being told it's just the flu or growing pains but this has been for almost 2 years straight without any longer than a weeks break and no one around her is getting sick. Anyone know exactly what this is or any suggestions?