Ladies and Gentlemen, the ‘anxiety box,’ which I just found on the internets. Disturbing, metaphor, or both?

I was just going to say: I’m usually a fairly mellow person (or maybe I’m not? You tell me!) but every now and then, my heart starts racing with a mix of worried anticipation and joyful dread, for no specific reason whatsover. I either drink way too much coffee – or –  have some 7th sense of things that are yet to come. (My 6th sense being that I can FEEL it when the office phone is about to ring. Like  I really, really can.)