me bc i have POTS (specifically the hypovolemic subtype) basically i have a real low blood pressure and high resting heart rate and when i stand up i feel faint all the time. extra sodium helps talk to a doctor tho if you have any concerns. if it’s a symptom of something it might not show up in blood work but from other tests
i know iron deficiency can lead to these symptoms, not sure about zinc i had a similar problem and my doctor did an echocardiogram to diagnose (sadly they couldn’t find anything wrong w my heart so it’s something else lol), so maybe ask your doctor about that (assuming they didn’t do an echo when you got your blood work done)