My 14 year old daughter has had spells of feeling light headed reccently, has not passed out, but become dizzy and had to sit down immediately. She had blood test last week. Results came today Thyroid ok, complete bloodwork good, liver enzymes good, but bilirubin high. Doctor has ordered an ultrasound of the abdomen. I am worried, not knowing any possible causes of this. I would like to go in a little informed of what possible reasons could be.