I too am the heartbeat in my head...(along with some dizzyness), now 5 weeks after having had a concussion. My concussion, rather embarrassingly, happened when I was running with my hands in my pockets and slipped on some ice and planted the front of my head on the sidewalk with some force. I was unconsious for a bit, brought to the hospital on a traction board and released what I thought was rather quickly. In any case, I guess my question for you was how long did the heartbeat thing last and did you experience dizziness? I find I get dizzy when looking up, or when laying down and/or getting up from laying down.