How can I get over my fear of rapid heartbeat?

I suffer from panic attacks, and it's to the point where I can't do ANYTHING that causes my heart rate to go up. If it does, I will end up having a full blown panic attack because the symptoms feel similar to when I'm having an attack. I'm also afraid to eat or drink anything with sugar cause that can cause you heart rate to go up also. My main concern is how I'm afraid of rapid heartbeat. The reason I panic when my heart rate goes up due to running, lifting heavy things, or simply doing strenuous activities, is because I'm afraid of my already accelerated heart rate and the panic attack ontop of that to cause me to go into cardiac arrest or have a heart attack. I literally live my life trying not to do anything that will cause my heart rate to go up, and it's ruining me. Please help. And I don't want to take meds so there's no use in telling me to take some. And no use in telling me to work out either, cause that's the problem....