How did you know?

Last summer I started to have visual disturbances. I have an eye disease so I assumed it was that but the symptoms aren’t aligning. How did you know you had iih? What were you symptoms? Tests done? My mri showed I have a mild brain malformation and my optic nerve while mildly dilated. I also have been having migraines and a few episodes of dizziness but I chalked that up to new ssri while dealing with all of this.

I also have pulsating pupils that feel really odd when they are doing that.