loss of vision + fainting. ideas ?

I am not asking for medical advice. this happened a whiile ago , but i’m still curious about it , if anyone has any ideas or insight ? i was at work and felt very dizzy suddenly. it felt bright , overwhelming. i felt like i was going to pass out and then things got blurry. like when you’ve just woken up and things are blurry ? but i was conscious then and the feeling stayed. and then i couldn’t see. it was extremely grainy and i could only identify colors very lightly ( everything looked see through and pixely almost ) before it was just all white and nothing was even slightly discernible like a few seconds previous. i panicked for a couple seconds and felt around trying to identify stuff and trying to furiously blink the blindness away to no avail lmao - all while feeling dizzy and lethargic i stumbled over to a corner finally and felt around and puked a little into a trash can before passing out on the floor and having to be woken up by frantic coworkers. i was very hot and i was sweating. an ambulance was called for me but nothing was really found and treated at the hospital. had the same questions when i left. I’ve only ever had one experience similar in elementary school where i lost my vision the same way and stumbled around before my teachers noticed and i passed out later for about fifteen minutes in the nurses room. i didn’t get sick though and nothing was really found out either that i know of then when my mom took me to the doctor. both happened out of the blue on a day i felt pretty normal. this most likely has some kind of correlation ? but i have epilepsy as well since i was 14. any ideas ? just for my curiosity as google doesn’t get particularly specific.