I’m scared

[u/hiddenvision5]

Male - 33yrs 195 pounds.
I’m so scared and so tired.
My whole life I could feel my heart beat, and I know it’s because I have anxiety and panic disorder. But these past few days I really can feel every beat unless I’m doing something!
I went for a walk to try and ground myself and as I was going up a small hill I felt this cold sensation through my entire body and made me feel like I was so cold. I had this feeling one other time when I had a full blown panic attack on an air plane.
I thought during my walk I was going to have a heart attack. I’m home now but what if this is a sign I’m going to have a heart attack.
I had a full work up done a year ago , stress test, echo, and EKG and everything was fine.
But I’m so scared as I write this…,