Could thrombosis of the cranial venus sinuses be the cause of worsening 4year idiopathic intracranial hypertension and neck ear and sinus pain?

Venous sinus : The cerebrospinal fluid (CSF) drains into the venous sinuses. Thrombosis of venous sinuses are likely to slow or impair CSF absorption which is likely to be associated with intracranial hypertension or worsening of this latter condition if present

See Neurologist: Cerebral sinus thrombosis is a rare condition that requires emergent care. 20% of cases arise from patients with IIC. If you have had IIC and find it getting worse, perhaps with visual blackouts, see your neurologist, particularly if you have a VP shunt. It may be blocked. If you do not have a shunt, then it is more likely that your IIC is worsening.