Burning in the Back of the Head

My 14 year old daughter has been in the hospital for 3 weeks now! She had a lower lumbar procedure as a rule out for a tumor/swelling of spinal fluide in the head. Since this procedure my daughter has had severe burning in the back of the head. My daughter has never had migranes or headaches until this procedure.
This is a subset from the reasoning for her hospitalization. Her previous symptoms included upper abdominal pain (had her galbladder removed) nausia and vomitting. The more I read the more concerned I am as a parent to treat based on the side effects. It is evedant that this is a side effect but unable to get a diagnosis of the issue. We have been told to treat the symptoms but am begining to see a spiral effect with this methodology