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This is Dr. David
he could be having severe migraine headaches.
he should be trying migraine headache medications like imitrex or topamax or maxalt to see if they help.
he should get an eye fundus exam to check for Papilledema, but his spinal tap showed normal pressure.
he could be having chiari malformation with low cerebellar tonsils dipping down into the foramen magnum. spinal taps need to be avoided in patients who are at risks for chiari malfomrations and can make chiari malformations worse.
he should consult with a neurologist as well as a neurosurgeon to see if he might have chiari malformation
let me know if you have questions.