MY SON HAS SEVERE STOMACH PAIN, CONSTANTLY THROWING UP, UNABLETO HOLD ANYTHING ON HIS STOMACH, ALL TEST HAS COME BACK NORMAL, THIS OCCURS APPROX 3-4 TIMES YEARLY, AND HAS BEEN HAPPENING FOR ABOUT 5 YRS NOW, NO DR'S SEEM TO KNOW HIS PROBLEM..PLEASE COULD YOU GIVE ME SOMETHING TO GO ON...THANKS