What could be the underlying cause of my chronic headaches, facial pressure, balance issues, pulsatile tinnitus, and motion sensitivity, which started at age 7 and worsened over time, despite normal CT, MRI, and MRV scans, and lack of relief from gabapentin (neurontin)?

Evaluation of Chronic Headache with Pulsatile Tinnitus and Positional Symptoms

You need urgent neuroimaging with MRI brain (without contrast) and MR venography to evaluate for idiopathic intracranial hypertension (IIH), despite your normal optic nerve examination, because your constellation of pulsatile tinnitus, positional headache relief, and motion sensitivity strongly suggests elevated intracranial pressure that can exist without papilledema. 1, 2

Why IIH Remains the Leading Diagnosis

Your symptom pattern is highly characteristic of IIH, even without papilledema:

• Pulsatile tinnitus is present in the majority of IIH patients and is a cardinal feature that should prompt evaluation for elevated intracranial pressure 1, 2
• Positional headache relief (better lying on stomach/left side, worse on right side) is classic for IIH, as position affects cerebrospinal fluid dynamics 1
• Motion sensitivity and balance issues occur in IIH due to pressure effects on the vestibular system 1
• Approximately 5-10% of IIH patients have normal optic discs at presentation, making absence of papilledema insufficient to exclude the diagnosis 2

Critical Next Steps for Diagnosis

Imaging You Need Immediately

MR venography (MRV) is essential to evaluate for:

• Sigmoid sinus wall abnormalities or diverticula (commonly associated with IIH) 1
• Venous sinus stenosis (present in most IIH cases) 1, 2
• Transverse sinus stenosis or thrombosis 1

Standard MRI brain without contrast should include:

• T1-weighted, T2-weighted, and FLAIR sequences 3
• Evaluation for empty sella, flattening of posterior globes, and optic nerve tortuosity (all IIH findings) 2

The Lumbar Puncture You Requested

You are absolutely correct to request a lumbar puncture - this is the definitive diagnostic test for IIH 1, 2. The opening pressure measurement is critical:

• Opening pressure >25 cm H2O in adults confirms elevated intracranial pressure 2
• Normal CSF composition rules out infectious/inflammatory causes 2
• Therapeutic benefit often occurs immediately after LP in IIH patients, which would support the diagnosis 2

Why Your ENT's Reasoning About Vestibular Migraine Is Flawed

Your ENT stated vestibular migraine "had to be episodic" - this is incorrect:

• Vestibular migraine can present with chronic daily symptoms, not just episodic attacks 4
• However, vestibular migraine does not typically cause pulsatile tinnitus or positional headache patterns like yours 1, 2
• The continuous nature of your symptoms over two years makes IIH more likely than vestibular migraine 1

Why Gabapentin Isn't Helping

Gabapentin has no proven efficacy for migraine prophylaxis and would not be expected to help IIH:

• Pooled evidence shows gabapentin is not efficacious for episodic migraine prevention (OR 1.59; 95% CI 0.57-4.46) 5
• Gabapentin is only potentially useful for cluster headache, which does not match your presentation 6, 7, 8
• Your worsening on gabapentin suggests you need treatment directed at the underlying cause (likely elevated intracranial pressure), not symptomatic medication 5

Red Flags in Your History That Demand Workup

Several features mandate aggressive evaluation beyond what you've received:

• Progressive worsening over 2 years with continuous symptoms 3
• Pulsatile tinnitus with visible pulsations (objective finding suggesting vascular/pressure etiology) 1, 2
• Positional component (worse upright, better recumbent) 1
• Visual symptoms (pain with eye movement, peripheral vision changes) 2
• Muffled hearing and ear pressure (can occur with IIH due to increased CSF pressure in the inner ear) 1

What Your Doctors Should Do Next

1. Order MRI brain without contrast AND MR venography specifically looking for IIH findings 1, 2, 3
2. Proceed with lumbar puncture with opening pressure measurement regardless of normal imaging, as this is the gold standard 1, 2
3. Formal ophthalmology evaluation with optical coherence tomography (OCT) to detect subtle optic nerve changes not visible on fundoscopy 2
4. Stop gabapentin as it provides no benefit for your condition and causes adverse effects (dizziness, somnolence) that overlap with your symptoms 5

Common Pitfalls Your Providers Should Avoid

• Do not assume normal optic nerves exclude IIH - up to 10% of cases have normal fundi initially 2
• Do not dismiss pulsatile tinnitus as benign - it mandates vascular and pressure evaluation 1, 2
• Do not accept "clear" standard MRI/MRV as ruling out IIH - opening pressure measurement is required for diagnosis 1, 2
• Do not continue ineffective medications like gabapentin when the underlying diagnosis remains uncertain 5

If IIH Is Confirmed

Treatment options include:

• Acetazolamide (first-line medical therapy) to reduce CSF production 2
• Weight loss if applicable (can be curative in some patients) 2
• Venous sinus stenting if significant stenosis is identified 2
• Optic nerve sheath fenestration or ventriculoperitoneal shunt for refractory cases 2

Your insistence on lumbar puncture is medically appropriate and should be pursued urgently - the combination of pulsatile tinnitus, positional symptoms, and chronic progressive course makes IIH the most likely diagnosis requiring definitive testing. 1, 2