Thank you all for the ideas you have shared with me regarding my daughter's headache. Just to review, she developed an unrelenting headache on 11/16/13 and up until last week no doctor has been able to find the reason.
Her pain spiked last week and she was admitted to the hospital. Some smart pediatrician thought to look in her eyes and saw optic nerve involvement.
Opthamologist confirmed papilledema (swelling of optic nerves), MRI (2nd one this month) showed nothing. So they did a lumbar puncture and she had an opening CSF pressure of 48cm. Highest pressure the docs have ever seen