i have same problem no warning just fall not conscious until I hit the ground now more than 32 since 2008.
I have had 2 knees replaced and ligaments repaired. Neurologist says Drop Attack but Doctor said
Vascovagal syncope. No treatment or MRI nothing still fall.
The scary thing is I stepped off grass onto beach facing west when I woke up I was 6 feet facing north south on my back on the sand. I do not always travel mostly just go straight down sometimes wake enough time to put my hands in front of my face. Twice nearly run over so it is important I find out WHY?
Sometimes I do faint so add all falls now 74 and I have fainted since i was !!years old no sport.