Hi Don! I have also the same symptoms and my doctors also tell me ut is panic attacks. I am a professional athlete(28yrs) and in great shape, also in the team tests. I started to experience these symptoms this year 30min after an exercise, got dizzy, wanted to catch my breath outside, legs started shaking. Been tested(ekg at stress, ultrasound, longtime 2 days ekg) by two cardio doctors and they said i can continue as an athlete, the other one said lets test you again after 2 years and the other one suggested the sports recomendstion once a year. I have little blowing soudn in one of my valves. And had it since i was born. It was earlier found (3years ago) in a heart test that was done as new routine to hockey players. But it hade not changed to worse since 2 years ago. And the doctors said it is very common to get fear after these kind of symptoms and as sterss of the kind of valve condition i was diagnosed with.it means the work for me. Well now I still have betteand worse r days and sometimes get small attacks(nervsystem fires hot, high pulse etc) home alone, at the end of games, starting a phonecall, at nighttim. then I have often got tye same feeling you felt of something in my throat or like a shirt that is too tight. Waking at the middle of the night. But i am back playing the games, Something in my life his year that have been stressing me besides hard trainings. I have lived away from my wife in another country, had the hardest ever preseason, we also had a stressy situation regarding my wifes jobb and then I was benchd and was not the trainers first choise for my position, this is often hard for an athlete and his stats. When the doctors say to me that i can continue 100% and they have a responsibility and I should belive them. Sometimes I am tough scared and wonder what is wrong. I feel there is a huge psycological factor and my doctor also recomended me to try to face the stressy situations and get use to them..i am aperfectionist, or was and We have some "bipolar" anxiety and depression among my family. Done some meditation and it feels good so maybe i just should let the doctors follow me up and just say fuck it to my anxiety. Mr poland