That is exactly what they diagnosis too. IST is only a hair difference to Post-COVID POTS. I get it that there is not enough data to really help me/us with treatment or a cure. I feel so defeated and at my wits end.
I have had an extensive cardiac work-up
48 hour monitor
30 day monitor - a lot of runs of supraventricular tachycardia
echocardiogram
I have had just about all lab tests
Stress test -I failed
6 minute walk- I failed
CT-angiogram - think goodness there is no damage to my heart.
MRI of the chest

It has been an experience and with no treatment plan.