I am writing in desperation. My daughter , who is 16, has been sick ever since we have returned from Mexico in February. Her symptoms are vomiting, diarrhea, stomach pain and fatigue. She has not been back to school since mid-March. We have taken her for numerous tests and have seen numerous doctors and no one has yet to resolve her problem. Now she is getting where she doesn't have an appetite and when she eats the slightest little thing she gets severe abdominal pain. We took her to emergency for treatment yesterday which consisted of IV's and now she is scheduled to see gastroenterologist to rule out other problems which I know she doesn't have. She was in fine health until our return from Mexico. I am not trying to put a damper on anybody's trip because we loved Cabo but I am trying to find out if anyone out there has had this problem and for a long period of time and if so if they got a diagnosis and what type of doctor they seen. We are getting desperate to help her feel better . Thanks for anybody's help they may have. Her doctor thought in the beginning of all of this that she had Montezuma's revenge but all the tests have come back negative and she still has the symptoms.