And it has never happened to me before.

After work, my bf and I went to the hookah lounge, like we do on many Saturdays after work. We were there for about 3 hours. During that time I slowly sipped about half a beer ( I wasn't in much of a drinking mood). We only ordered one bowl of shisha (we often order 2 within a 4-5 hour sitting), and had several little breaks from smoking, so I highly doubt that any of that is the cause.

We stood up to pay and leave. We are friends with the owner so we were standing there chatting for a little over 5 minutes. I felt fine. Then I began to feel a little dizzy, in the back of my head. Like a minor head rush. Nothing concerning, just very mildly annoying. I thought it was maybe because I was starting to get tired. We began to walk out, my bf and our friend were deep in conversation and walking a few steps ahead of me. I walked maybe 10 feet from where we had stood talking, and all at once was overcome by dizziness. Within about a second and a half my vision had almost entirely gone dark and I staggered a few steps before falling to the ground. I had thrown my arm out to catch myself and keep my from faceplanting into a wall. The guys turn around and see me, rush over and help me over to a couch. This is where I lost consciousness. I remember our friend saying something about water, and I saw my bf standing there looking concerned and then both turned around. I thought I blinked and all of a sudden they had water and a cold damp rag and were fussing over me trying to figure out what happened. I now realize that I blacked out for maybe 30 seconds to a minute.

I felt completely pale but at the same time felt my face beginning to flush with embarrassment because the other customers were staring and whispering to each other trying to figure out what was going on.

We had planned on walking home but a friend of a friend volunteered to drive us the few blocks and my bf took me upstairs and made me take a cold shower then promptly put me in bed with water while he ran next door to get me a powerade and something to eat.

Withing minutes I felt fine, but my shoulder is still sore from catching myself.
Has this happened to anyone else?