Count me in. Been having them for years.
I had my first "diagnosed" panic attack in November of 2004, and they got more and more regular until I was having them daily (since 2007). Ended up in the ER several times because I was sure I was having a heart attack or suffocating. They first put me on Lexapro, to which I had a TERRIBLE reaction -- severe chest pains, anxiety through the roof, and suicidal thoughts, something I've NEVER really considered until then. It scared me so badly that after 4 days I threw the pills away. The attacks continued, and another doctor put me on Xanax and then Effexor. I recently discovered -- through the most terrifying attack I ever had --- that the Effexor was no longer working for me. My meds were recently switched to Paxil for daily maintenance/control of attacks, and Ativan for immediate relief. I'm still having attacks -- probably need more Paxil -- but the Ativan does well in stopping them in their tracks within about 10 minutes. I had my most recent one just this afternoon.
My attacks usually start with some sensation or pain in my body -- a tightness in my chest, a pain in my abdomen, a stab in my heart area -- which sets off fear that something is terribly wrong with me. Then I get tingling in my arms, then a rise in my heart rate. Then as the adrenaline does its job, I start trembling and sweating. I get light-headed and hot and start hyperventilating. As it progresses and gets worse, I may get chest pains, shaky legs, nausea and dry heaves, and/or a disassociative feeling, as if I'm in the world but not part of it -- that the things going on around me are not aware of my presence. These sensations can be very mild and only last a couple of minutes or they could last for hours, a situation calling "training", where attacks repeat themselves over and over again.
I can't be sure if ASD is a result of my panic disorder. For one, I haven't been officially diagnosed with ASD. Second, during the time I started having them regularly, my life was coming apart at the seams. So I assumed that overwhelming stress is what caused all the attacks. But looking back I can pinpoint times in the distant past when I had what I can call now either panic attacks or meltdowns.