I hear ya Mike. Panic attacks galore for me, for years. It took me a long time to figure out what was causing them, psychologically that is.
I would go through long periods of having what fits the description of "Panic Disorder". It started when I decided it was time to try having mature adult relationships. I would get very depressed and insecure, overly obsessed with traits about the person that I did not posess (comparing myself to them). Then those obsessions would turn into the fear that I am going to get dumped because of my out of control emotions, which was a fear of abandonment and rejection.
I eventually learned that depression was scaring the hell out of me. It was always during a breakup that I would start having these panic attacks.
There is a lot you can do with inner dialogue, once you realize that thoughts ALWAYS precede emotions, and never the other way around. If you find yourself intensely studying every little sensation your body experiences and then being afraid of what it means, you are stuck in your own feedback loop. It even works out on paper. Since thought leads to emotion, and you are thinking about your emotions (in a fearful way), then you have a feedback loop.
Example
Scary thought: I will never be able to have a mature and healthy relationship.
Feelings: Adrenaline is released because now you feel flawed and permanently alone.
Scary thought: Oh no, there's that hot feeling in my stomach, this feels really bad.
side note-> that "hot feeling" starts near your stomach for a reason, your adrenal gland is located very close to your kidneys!
Feelings: More adrenaline, heart starts to thump because you are anticipating something awful.
Scary thought: I don't feel well, my heart is going to fail because of all it has been dealing with, it can't handle this much intensity.
Feeling: A surge of more adrenaline and now you are shaking because you don't want to have a heart attack, the adrenaline is partially converted in your brain to noradrenaline, which is a potent "fight or flight" neurotransmitter , so your mind just got a big boost in how fast it is thinking, which makes you calculate disaster even faster.
side note-> noradrenaline is another name for norepinephrine, just like adrenaline is another name for epinephrine, epinephrine (aka adrenaline) is the active ingredient in primatine mist for treating asthma attacks
I won't go on, the point should be clear by now.
A variant on the above feedback loop is the guy who fears he is going crazy or losing his mind. It shouldn't be too difficult to substitute the appropriate thoughts and feelings above. This was alway my personal fear, since I grew up in a house with a schizophrenic father, but that is another story.
I don't expect that this information will cure anyone, but I hope it will help enlighten and encourage you to take control.
Craig