i first got panic attacks 12 years ago. I was in the hospital for 3 months having 17 hour a day panic attacks. I got out of the hospital and still had them off and on for years. Through self experimentation i have beat them, having one in the last 2 years but that was due to pneumonia. The biggest factors in me beating them: I simply lost my fear of death, if I go I go, and thats that; I will never have sugar or caffeine on an empty stomach, and try to maintain a balanced insulin level with my eating; I stay VERY hydrated, drink tons of water, which I believe may be the biggest factor in beating panic; get 7-8 hours sleep; just dont let them own you, because they cant kill you, ever.
And I believe after heavy lifting the surge of adrenaline and hormone change is what causes "panic feelings", but is not an attack. I have experienced the exact same thing.