My 17 Year Old Daughter Has Been Suffering From Abdominal

My 17 year old daughter has been suffering from abdominal pain on and off for about 3 weeks which has now migrated to the right side. Sometimes it is a sharp pain but comes and goes. She has also had diarrhoea intermittently with a bit of discharge. She has been tired, emotional and not feeling well and suffering from a lot of nausea especially in the morning. The local doctor suspected appendicitis and today she spent 4 hours in A&E. Her blood tests were normal except for slightly elevated bilirubin. They were unsure as to the diagnosis of appendicitis and sent her away without answers. These symptoms are not normal for her at all and I'm quite concerned.