[Proud90sKid]

This is actually normal for panic disorder and is a big part of how the condition actually works. Typically, panic attacks come on via a feedback of anxiety and somatic symptoms. One time I was convinced I had a heart attack and went to the urgent clinic (fortunately not ER as that would be pricey in the US). One thing that may help is beta blockers. They block the effect of adrenaline on beta adrenergic receptors, lessening the physical (though not mental) symptoms of anxiety. While not actually true anxiety medication, they can work as an adjunct med for panic disorder (sometimes they can work by themselves) by interrupting the mental->physical-> mental loop.

And fortunately, panic disorder itself often goes away but is often a sequela of another more general anxiety disorder.