i had severe rt sided headache x 4 days with nausea. went to Dr had brain scan and blood tests all normal. 1 day later developed scintillating scotoma that has now lasted for 5 days. Eye exam normal. I have no history of migraines and rarely get any kind of headache. My research shows scintillating scotoma as an aura preceeding a headache. My presentation is the opposite. days of severe headache and now the visual disturbances. Is that normal and how long can this last. it is very disturbing.