Hi My Son Has Been Back From A Holiday In

Hi my son has been back from a holiday in Turkey about a week and a half and he felt really sick on the plane journey home. He still has really bad constant nausea and stomach pain that comes and goes. He is waiting for results of a stool sample and has tried some anti sickness tabs prescribed by the doctor but the nausea is really getting him down. He is 21 and otherwise very fit and healthy and clean eating!!