Was this a seizure? Should I be worried?

[ineffableblunder]

Hello! This concerns an experience I had about a month ago. I didn't think much of it then, but after coming across some information about seizures I have become concerned. I'm hoping its just paranoia though!

I was in the ER room, not for me but with a friend who had very bad pneumonia. I had no symptoms of sickness, but I had been with her since that afternoon, and considering it was around 4 in the morning I had not eaten or drank anything for several hours. This is the part that made me dismiss the experience later, as I thought I probably just fainted from exhaustion and stress.

A nurse was trying to draw blood from her, and I was standing on the other side of the bed. Very slowly I started having bad tinnitus, and I took out my hearing aids because I thought they were dead, but it did not help and it sounded like my ears were plugged. As I tried to pay attention I felt a little bit nauseous, but thought it might've been from seeing the needle puncture my friend's skin.

My vision slowly started to go black from the corners and I began to feel dizzy so I clutched the bed handles to stay stable. After my vision went completely black I stayed there for a few seconds, after which I had no awareness and fell to the floor. My friend later told me I made a noise of surprise that made her look over before I leaned sideways and fell backwards. I did hit her IV and the wall slightly but there was no injury from it besides a slight ache on the back of my head.

After I gained consciousness, I was confused, thinking that I had fallen asleep and had been snoozing for a few minutes. I couldn't have actually been on the ground for more than a few seconds though, according to my friend, and there was no body spasming, though she said that my eyes never closed and were moving around.

The nurse came around the other side of the bed and helped me up, asked if I was ok several times. I replied that I was fine and apologized for falling asleep, but didnt realize until later that I was answering only in ASL (my friend is Deaf, and before I passed out I had been interpreting what the nurse was saying) so the nurse had no idea what I was answering.

He seemed to think that I passed out from watching him draw blood, although I had been in the hospital several times with friends over the past 6 months, seeing one spurt all over the floor and never had a reaction besides being a little grossed out.

I felt really sluggish and hazy, and needed to sit down as I suddenly felt incredibly hot, dizzy, and so nauseous I almost threw up. After a couple minutes, I felt perfectly fine and had no other problems.

I am a 19 year old female and I do not have any significant health issues. The only connection I might have to seizures is a genetic predisposition to neurofibromatosis type 2, but my MRI scan is clear of growths.

This was the first time this happened to me, and it has not happened again.

Is it likely that what I experienced was a seizure? And if so, should I visit a doctor to be checked despite how long ago it happened?