I have following symptoms since 5 years right now im 20 yrs old:-
1.dramatic increase in pulse rate on standing from lying position,black vision and foggy brain sometimes.
2.heart palpitations on climbing stairs or running
3.exercise intolerance
4.unexplainable random tachycardia.
5.extreme fatigue all day.
I went to a cardilogislt recently and he did ECGs,doppler echocardiography,24 hrs holter,thyroid test,cbc,electrolytes test,urynalsis and everything came back normal.My b.p is normal and my bmi is 21.7.
Is there anyone here with these symptoms who was diagnosed with POTS or IST?