Hi
Yes, have also had the heart pounding thing (and am still getting it). About 2 days after I had my concussion I kept getting what felt like anxiety attacks out of the blue, they were like little storms and the heart pounding things started not long after. Eventually these attacks tapered off, and my feeling was that they were something organic coming from the injury. I am very resistant to the idea of an "anxiety disorder", can totally understand anyone feeling insulted about this.