Read the whole thing, it's called mindfullness man, nothing fancy, you've described your personal experience with it which was very enjoyable and insightfull to read. You often hear people say 'just be mindfull', yeah as if it's something natural like breathing, it is but at the same time it isn't, it takes practice. In eastern spiritual disciplines (buddhism, Zen, Taoism etc..mind you i'm NOT talking about religion here!!) it's called the 'natural state' and many great artist have experienced mindfullness and described it in literature. Not to overcome anxiety per se, but as something that they experience when sitting in a forest or looking out over a lake etc, your mind just quiets down naturally and it's easier to say to your mind 'shut up i'm enjoying myself now', right ?.You could say that mindfullness is the absence of anxiety, that's why 'natural state'.
It's easier to get mindfull when you practice meditation. I used to have severe SA for years, at some point I just stumbled upon these great eastern teachings and started to practice it, after some months people started saying 'wow your so different now', as in you're so sociable and that frown on your face has vanished, just people responding positively to me helped like nothing else.