about my 24 yera old son,,,came from overseas...firts 2 days vomitaing then stopped...till now 8 weeks with consistant nausea....we diid all test...evn head scan,,,evyrthing is negatifs...plz i need help///we did colonoscopy...and gastro...evn the speciliast wasnt sure if he saw ulcers or maybe he has crohns disease..his answers get us more down