Ouch! I'm sorry that happened to you.

I used to randomly pass out. It'd happen at weird times when I wasn't thinking about anything bad. One time, I was walking in the woods and passed out off the path. When I came to, my dogs were laying there with me... waiting for me to get up. I had every kind of test possible to figure out what was going on. They couldn't find anything. I wasn't diagnosed with anything at the time.

I've realized now that it was a very strange version of a panic attack. Instead of the fight, my body did the flight thing. That's the best, unscientific, unverified by a doctor answer I have.

Since it's only happened once, do you remember what you were thinking about before you fell? What was happening in the room? What happened that day? I started to ask myself all that when it kept happening to me, and I realized I was internalizing too much.

I don't know that I'd tie it to PTSD though. Just my opinion. I had those episodes before my major trauma (there were little ones prior). PTSD made me hyper aware of everything for awhile and passing out actually wasn't an option my body felt like doing.

I hope it doesn't happen to you again. It is very scary and unsettling.