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Have you had this investigated before?
Excellent, that is reassuring. Has anyone discussed with you that this is most likely anixety?
I see, okay, so there is a condition called POTS - postural orthostatic tachycardia syndrome. An echocardiogram is useful but you should ask your doctor about this as they can do some tests. Treatment is with medication to stop your heart rate going too high and prevent these symptoms.
It depends how fast, as if very fast it can impact your blood supply, but going up and down as yours is, unlikely to have an effect.
No problem, take care.