Well, it doesn't sound like this, which would be a real cause for concern:
That was my initial diagnoses back when I wound up in the stroke ward for a few days. Not a fun place to be...
But the neuro doc changed the diagnosis after I gave him some research showing that the symptoms could appear without being caused by a stroke.
The final diagnosis was migraine. Which means "there's a problem in your brain, and we don't know what's causing it."
One of the symptoms I had was a blind spot, it sounds like what's described in the link you provided, but with fewer fireworks.
I've only had it happen two times. Now that I know the trigger, I avoid it like the plague, as I'd rather not have the effect become permanent. (The first attack left me with a mild speech impediment. The doc was able to confirm it, but no-one notices it but me. It seems to be getting better since I've gone on the stricter keto diet (Thanks, Patrick!).
I also had this, which was definitely no fun:
The second time I also got receptive aphasia. Even less fun.