What do you guys think?

I had a sudden blackout today. I hopped on a bus this morning—it was packed, easily a thousand people—and within minutes, the air felt incredibly heavy, like I just couldn't catch my breath. I decided to hop off at the next stop to get some air and clear my head, but as I was stepping off, everything just went black. I hit the ground hard, completely out of it. Some kind woman helped me up and gave me some water, and then I called my husband to come pick me up. This isn't even the first time; the last time this happened was last winter under identical circumstances—just an overcrowded bus and zero oxygen. To make matters worse, I’ve been waking up feeling like I’ve been through a physical brawl for months now; I can't seem to get any decent sleep, though I did manage to crash for twelve hours straight last night. I'm constantly thirsty, too, and frankly, I have no idea what is going on with my body. A few months back, it turned out my iron levels were bottoming out, and while the supplements helped, I still feel utterly depleted. What should I be doing here? I have a doctor's appointment this afternoon. Has anyone else dealt with anything remotely similar? My blood pressure is usually perfectly fine...

You really ought to see a doctor, because this doesn't look like a typical fainting spell to me. It doesn't necessarily mean something is wrong, but if you want to stop worrying about it, just get an exam. They’ll likely run some blood work. There's no need to panic.

Pregnancy, you say???? Honestly, you ought to undergo a full battery of blood work just to see what's actually going on inside there.
Personally, I occasionally feel quite lightheaded—it's usually due to low blood pressure, I suspect—so I make sure to drink plenty of water, which tends to help me out.
Best of luck.😘

Thnx taj, it isn't pregnancy—at least, it shouldn't be (according to the doctors). I'm already starting to feel pretty low about the whole thing.
😘

There’s going to be some issue with blood pressure... but it’s probably best if the doctor weighs in first.😁

Syncope—that’s essentially what you experienced. It happens when the brain doesn't get enough oxygen. This could be caused by low oxygen levels in the air, such as in an enclosed space, combined with anemia making it harder for your blood to carry oxygen. It could also stem from a drop in blood pressure due to underlying illness, dehydration, orthostatic hypotension, or perhaps even a dip in your blood sugar levels...

I had a checkup with my doctor yesterday, and she wasn't thrilled about my blood pressure sitting at 95/50. I went in for some blood work this morning so we can actually get to the bottom of things, though she seemed quite concerned; she even mentioned potentially heading to Mayo Clinic if my platelet count isn't where it should be, although her money is currently on blood pressure issues, iron deficiency, or maybe my blood sugar. I’ll have the results tomorrow, so we shall see.😲

Sam Hall15 said:Syncope—basically what you experienced—happens when your brain doesn't get enough oxygen. It could be from low oxygen levels in the air (like being in an enclosed space), combined with something like anemia making it harder for your blood to carry that oxygen. It could also be a sudden drop in blood pressure due to illness, dehydration, or orthostatic hypotension. Honestly, your blood sugar might have just bottomed out too.

I’m with them on this. It sounds like vasovagal syncope. It’s not really a disease; it’s more like an oversensitivity in the Vagus nerve (indirectly via the medulla oblongata) to certain triggers—stuff like heat, hunger, or stress. When that happens, the Vagus nerve works against the sympathetic nervous system, causing your blood vessels to dilate and your heart rate to drop. That sudden dip in blood pressure starves the brain of oxygen and energy for a second. Usually, you'll feel a wave of weakness, nausea, or that "faint" feeling right before it hits. It can happen repeatedly, so you really need to watch out for triggers. Avoid cramped spaces or huge crowds, stay hydrated, and for crying out loud, don't skip breakfast. The real danger is that it happens while you're standing or sitting, and if you don't catch it coming, you’re going to take a nasty fall and potentially hurt yourself. If you see someone going down, lay them flat and prop their legs up to help blood flow back to the heart. Don't try to make them stand up right away.

James Watson84 said:I’m inclined to agree. We’re looking at vasovagal syncope here. It isn't exactly a disease in the traditional sense, but rather an oversensitivity—mediated by the nucleus in the brainstem—of the Vagus nerve to specific triggers like heat, hunger, or stress, which ultimately leads to a brief loss of consciousness. Since the Vagus nerve acts as the counterbalance to the sympathetic nervous system, it causes blood vessels to dilate and the heart rate to drop, resulting in a sudden dip in blood pressure that briefly starves the brain of oxygen and energy. This is usually preceded by a fleeting sense of weakness, lightheadedness, or nausea. Because this can be a recurring issue, one really ought to avoid the typical triggers—crowded spaces or stifling environments—while ensuring they stay hydrated and never skip breakfast. The real danger lies in the fact that these episodes happen while standing or sitting; if you don't catch the warning signs, you face a potentially painful and dangerous fall. If you witness someone going down, the protocol is to lay them flat and elevate their legs to boost venous return to the heart, rather than rushing to pull them back onto their feet immediately.

Thnx taj😘
So, does this mean I'm stuck with this for the rest of my life, or what?

Well, I’m dealing with the exact same thing—blood pressure, blood pressure, way too low blood pressure! There isn't much else to do besides forcing myself to drink tons of water and actually eat something.

This has happened to me three times now.
First time, I was singing in the choir during a communion service at a youth retreat (no laughing, please). I was 13, and they barely caught me before I hit the floor.
The second time was at a massive outdoor Mass for the Virgin Mary in Venice—we’re talking a million people. I was 15, and I actually managed to slip out unnoticed right before I passed out.
Then there was the third time. I was riding the bus to my summer job. I was 16, standing in a total crowd, and I just "missed" a few stops before someone finally helped me into a seat.
Since then, I've been fine. Mostly because I refuse to step foot on a crowded bus in the afternoon, and if a church gets too packed, I just say a quick prayer and make my exit. He'll understand. I just can't deal with crowded spaces anymore.