Is it heart attack or panic/anxiety attack?

how to differentiate between heart attack and anxiety/panic attack? I was irritated with my father of late and was snapping at him every now and then.Anger outbursts were followed by shaky feeling inside. If I lay down I feel pulse throbbing in my limbs and chest and abdomen and heaviness and discomfort in chest. I am scared that I got heart attack. Or is it panic attack?

well you are still here so it is unlikely it was a heart attack. i really dont know the symptoms of a heart attack besides pain in the chest and pain and numbness in the left arm. i often think i am having one due to my anxiety but i am terrified of doctors. i get through them because i have had it happen often enough and survived. i figure if it was really a heart attack i would be dead by now.