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@WimVDD
Hi @Big_Ted. We only met on my Panasonic pr6000 thread as far as I know. It seems though there's more similarities than that.
A couple of months ago -completely out of the blue- I had this close-to-blackout for the first time. When descending from Alpe d'Huez I suddenly got dizzy, had these thoracal cramps and the feeling I was going to have a heart attack. I was in panic (my kids -14 and 15 yo- were alone in a rented appartement on the flanks of the Alpe) and thought I was about to die on the Alpe d'Huez. I didn't.
Back home I went to my GP and had the same thing while waiting in the waiting room. Panic again. She did some quick examination of my heart and blood pressure (she is also my sports medic), nothing wrong. A couple of weeks later I had it again. This time after going really deep on the bike with some mates. I felt a hard "bang" in my breast and it took me half an hour before I had a normal feel again. I went to the GP again and insisted on her to send me to a cardiologist. I suppose our health system here in Belgium is better than yours because two days later I was doing these tests at the Ghent hospital. Conclusion so far: my heart is healthy but probably -after an absence of more than 20 years- I suffer from asthma again. Lung specialist will see me end of next month. My GP insinuated another possible reason: stress. Severe stress (I had some the last year) can upset your stomach, making it to produce more "gas". The gas inflates your stomach so it puts more stress on your diafragm, leading to the typical "I'm going to faint or have a heart attack" feeling. I'm not saying this is what you "suffer" from, only that it could be something else than arrythmia.