Woah that was intense!
I don’t know what just happened, but this id the first negative reaction Ive had to biofeedback. 2 minutes of “high heart peace” just triggered the craziest low frequency metallic ringing sound in my head, and anxiety! Luckily it wore off after 20mins and some 4-7-8 breathing… but man oh man, I dunno if this thing is working the way its meant to! Im sticking with Breathtuner, heartbreath and VaYou