I get dizzy spells on a daily basis. Part of a long list of symptoms.
The one time I passed out cold was right after blood donation.
I was entering a diner from an alley entrance, brick cobbled. I had a vague sense of surprise that I saw bricks coming toward my face, didn’t have any sensation of falling at all. The bricks seemed to be moving towards me. A really hard slam on the forehead told me what happened just before everything went black. When I came around, one of the diner cooks was handing me a huge carton of crinkle cut fried potatoes. He insisted I eat enough of them to feel strong before attempting to come in to dine.
It was the one time I didn’t have a Mountain Dew big gulp right after donating. Usually the sugar rush was enough to get me going from here to there. That time I headed right for the prize winning Awful Awful burger.