I wonder if anyone else has experience with this. Except at occasional times where I am in a good mood, when I have thoughts, even positive thoughts, I get a panic on, my heart skips every other beat, and my heart rate goes up from maybe 65 to 90 in a few minutes, my chest also gets very very tight, I cannot breath in deeply. All this post is for is to see how common this sort of thing is, and also, to find out more about it in detail scientifically (I know the basic reasons behind it, my body is trying to activate fight or flight and therefore I am getting tight to activate my muscles and enable quick breathing and fast running, and the heart rate goes up to get more blood to my muscles) because it's really really uncomfortable and strange, when you spend months, trying to learn how to overcome this response to stressful thoughts, and still can't even remotely override it.