A friend of my dads had a similar issue but it was caused by his internal defibrillator. The new ones are supposed to be better but back in the day aparently internal defibrillators kicked hard when they went off and this guy dreaded it every time which would cause him to panic until his heart rate spiked enough to set it off. He would feel his heart starting to speed up and he would start getting anxious about the defib going off which would make his heart rate spike more which would make him more anxious and that cycle would continue until the defib went off and basically hard reset him.
A friend of my dads had a similar issue but it was caused by his internal defibrillator. The new ones are supposed to be better but back in the day aparently internal defibrillators kicked hard when they went off and this guy dreaded it every time which would cause him to panic until his heart rate spiked enough to set it off. He would feel his heart starting to speed up and he would start getting anxious about the defib going off which would make his heart rate spike more which would make him more anxious and that cycle would continue until the defib went off and basically hard reset him.
He took “have you tried turning it off and on again?” too seriously