Very interesting ideas. I agree with alot that you say Davit. Especially because my last panic attack seemed very "out of nowhere" as I lay watching a movie , completly engaged and attentive to it, then jumped up quickly and started panicking. But what made me suddenly jump up? Well I had a weird tingle in the side of my head and instantly thought that I had an aneurysm that burst. So that is why I jumped up quickly, ran upstairs in full panic mode stirring up many more physical symptoms, convinced I needed medical attention. Because it happened so quickly and there seemed to be no sign or trace of a panic attack only moments before might render an "out of nowhere" argument but the fact that one small, quick paced symptom could cause such catastrophe gives some reason especially when this little symptom has such power to bring on much more (negative thoughts, many more physical symptoms, etc.) And yes for that matter I was very tired that day and forced myself to watch the movie thus giving another precursor to the attack. Perhaps if I wasn`t so tired my mind would`ve been strong to judge that a small tingle couldn`t possibly be fatal. I guess because I didn`t know moments before that the attack would happen makes it a sudden, ``out of the blue``  with no warning attack as many people are saying they have but you are right Davit in saying that that doesn`t mean there wasn`t a reason for it.  

Yes I have had Health Anxiety for 3 years and just like Debi I have gone through many, many tests. I worry about my health so much because I ultimately worry about dying. I am most fearful of the things that can kill me( heart attack, anuerysm, blood clots) not things like having the flu or a cold. If I have a symptom that I can credit to being something thats not serious than I am not bothered. Its as soon as I have a symptom/symtoms that I think could be something more serious than I am panicking. I break this cycle though by quickly trying to give myself an alternate reason for the symptoms I feel. Like if I have a headache I try to think of all the other reasons I could be having it like feeling tired or sore neck instead of thinking its an anerysm. If I can do this quickly enough than many times I break my cycle. I have also used the 10 questions to challenge my thoughts. Hope this helps.