Hey, I'm prone to panic attacks due to a chemical imbalance...it sucks as it also cause Obsessive Compulsive Disorder (OCD), depression, and bi-polar disorder (which goes with depression) in me.
Anyway, my panic attacks have never been so bad that I thought I was going to die. Basically, with me I start thinking about a problem in my life or something that's buging me and it can escalate to the point where I feel I need to fix it immediately. My heart beat gets more rapid, I can't sit still and my mind is going a mile a minute and I can't focus on anything else. I used to get 'em in school during exams sometimes and that REALLY sucked.
I honestly feel that the best way to deal with them is to use your mind to go around the problem. It's difficult to describe but after trying many different meds (paxil included) - which all fucked me up even worse by far - I eventually just fixed my own head enough at least for me to live a normal (or at least somewhat normal) life.
If I can help in any way (like my experiences with meds like paxil, zoloft, lithium, etc.) please PM me dude.