While imbalance upon standing up is very common (and can be dangerous if you have bad balance anyway) I don't think that's what you were describing. All it is is over or underbalancing, vision doesn't go fuzzy or anything else you described. As with all other common medical conditions like headaches etc., it's likely that this just affects some people more drastically, and you're one of these people just due to your DNA. I highly doubt you have a real medical issue, and if you go and see a doctor they probably won't try and act until you actually get dizzy and walk off a bridge or something. Right now your doctor is probably just thinking you're over-exaggerating overbalancing when you stand up quickly, which seems to be the condition you have.
For now, just start standing up more slowly and carefully, like
@Purrloin said. This is the sort of thing where if you do it for a few days, maybe a week, it becomes a habit and in the future you'll stand up carefully and slowly 90% of the time. Just try to prevent it from happening at all. Also, although you said you don't have iron deficiency, it can really do no harm trying. At one point it turns out my iron levels were quite low and I managed to find some iron tablets which helped my constant headaches a little bit (lessening the pain), so even if you don't think you have low iron levels, it's quite possible you do, and if you had tests at the doctor it's totally possible you've developed low iron levels since then by not eating the right diet. If not then take them anyway and hope for the placebo affect
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As for dizziness in general, a bit about me :v. I get dizzy and I get head aches a hell of a lot, which is pretty annoying, I'll be honest. This is down to two things. The first is that whenever I get high up off the ground (note that my definition of high is like 8 feet or something) I totally space out and get really dizzy, which is just dangerous. This isn't due to low oxygen, because my blood is pretty healthy and I can survive up hills and mountains very well if I can't see how far up I am. It's just due to my huge fear of heights which completely messes with my head, so if I'm anywhere where I can see a drop I have to hold on to someone and walk slowly somewhere else, and then sit down. Otherwise I
will fall over and if I fall over the drop or just hit my head on the ground it could be fatal. It's not very useful and looks ridiculous to other people when it happens, but hey. I don't think there's a lot I can do about it.
The other time I get constant dizziness and headaches is when it's hot. That's because in Britain, which is a small island let's not forget, all heat is full of moisture and the humidity slowcooks my brain or something, IDK. That's what it feels like. My internal temperature is completely out of whack so that if there is humidity I don't feel cold at all. Not cold wind or cold rain of anything. All I can feel is the heat and it means that during the summer I can't go out or I run the risk of collapsing. This wasn't as big an issue, but thanks to global warming the summers here are now like 23 degrees celcius every day, which is way higher than I can handle. I haven't seen a doctor about it, but once again I don't think there's anything I can do about it besides moving to Sweden or Spain. I went to Spain with school and it was the only time I've ever enjoyed heat, because it was dry there and it was so nice
.
Also, since headaches and dizziness go hand in hand, I'll put this here as well. I always have a headache. Like 100% of the time. The only thing that solves it is drinking herbal tea (painkillers accelerate the pain more, which literally makes no sense because I know how painkillers work >___>), and even then it's only gone for about 5 minutes and then it's back again. I've gotten fairly used to it now, but sometimes the pain is exaggerated to a point where it's painful to turn my head or focus on something without me having to close my eyes for a minute and regain myself. It also means that I have a lot of trouble sleeping, because I have to wait for the pain to die down, which is something I really have little control over. I tried to research it online and there are a huge amount of things which set different people off with headaches, so it seems possible that I'm just set off by everything? It could be much more simple and just be that since this country always has a wet underlying tone to it that the dizziness caused by humidity and moisture in the air is always present with me but sometimes to a lesser scale? Both make sense, but if anyone has any tips for this I would be highly appreciative.