Anxiety masking POTS?
So my cardiologist diagnosed me with inappropriate sinus tachycardia despite my resting heart rate being low most of the time (low 50s). However, every time I’m at the doctor my heart rate is well over 100 because of anxiety. So they saw that, decided IST must be the cause of my symptoms, prescribed me ivabradine, and said see you in a year.
I am not convinced that that’s what I have, since like I said my heart rate when sitting or laying down is usually in the 50s and never randomly spikes unless I stand or am anxious. When I did a poor man’s tilt table test at home, my sitting heart rate was 55, and then after standing for 5+ minutes my heart rate is 100+ the whole time and I get dizzy and dark vision (not locking my knees). I also notice discoloration due to pooled blood in my feet and ankles. I’m wondering if I have POTS, but i know if I do the same test at the doctor they wouldn’t get a normal baseline hr and I’m not sure if the increase would be as noticeable because of it.
Has anyone else had a similar experience?