The symptoms you mention read like scintillating scotoma: https://en.m.wikipedia.org/wiki/Scintillating_scotoma https://en.m.wikipedia.org/wiki/Scintillating_sc

The symptoms you mention read like scintillating scotoma: https://en.m.wikipedia.org/wiki/Scintillating_scotoma https://en.m.wikipedia.org/wiki/Scintillating_scotoma I've had it happen many times and it's usually followed by a regular headache. Quite terrifying the first few times it happened to me. Felt like I was losing my sight. Spending the whole night gaming when I was younger would sometimes trigger it in the morning. Thanks to not having any more time for that, it hasn't happened in years.