Hi,
Thank you for posting your query at DoctorSpring.com
I have noted your symptoms. Normal MRI of brain excludes conditions such as brain tumors. I also assume that MR venogram was done to exclude cerebral venous sinus thrombosis (CVST).
In this situation, I would agree that idiopathic intracranial hypertension should be considered and excluded. Eye examination may show papilledema (swelling of optic nerve discs). CSF would be under high pressure. Medications such as prednisolone and acetazolamide reduce the intracranial hypertension and headache/heaviness would subside.
CSF analysis (after lumbar puncture) would also help to exclude meningitis (infection), though the chances are very low.
Best wishes,
Dr. Sudhir Kumar MD (Medicine), DM (Neurology)
Senior Consultant Neurologist