Thank you for sharing your experiences with us. I also notice that I have a more intense breathing pattern and heart rate, and I agree that epinephrine would be a major factor in inducing this effect. I would like to add to your thoughts that norepinephrine, which is also produced in the adrenal medulla, can partake in promoting the fight-or-flight response, too. It can be overwhelming sometimes but good thing we produce cortisol so that we can have a little bit more resistance to stress.