Your family doctor is right.
Pain killers like ibuprofen
medicines like niacin and anti depressants like Wellbutrin
,all can result in increase of liver enzymes and can result in fatty liver
Besides these medications ,other causes for high liver enzymes and fatty liver could be alcohol consumption,diabetes,obesity,high triglycerides etc.
You must stop all medications as advised by your doctor.
Quit alcohol,if taking.
Stop junk foods,sweets and colas.
Avoid deep fried foods.
Consume fresh fruits and green vegetables.
Reduce calorie intake and reduce your weight.
Do regular exercises.
Get your liver enzymes checked after 8 weeks.
If still high then you may consult a gastroenterologist
and get yourself evaluated thoroughly,other wise most likely they should be all right.