Hi..could it possiby be reflux? That can cause feelings like you can't breathe.

My voice disappeared for a while....I thought it was laryngitis (which I've had in the past and required meds)..the the ENT said the redness was in a different pattern signifying reflux.

I used Zantac twice daily for a while...my voice is back. I tend to use it when I need rather than daily now.

The anticipation of having a heart attack would definitely trigger anxiety. It's a difficult cycle to stop.

quincy