Diagnostic Techniques, Treatments Forum - My Old Concussion: a Hidden Coup-contrecoup Injury?

Listen to my head injury story and tell me what you think.
Every hear of the "trust" game? You fall backwards into the arms of a friend, and they catch you, and you have thus learned to trust. 11 years ago I played a variation of the trust game with friends where two of them would catch me.
The problem was, in that moment, each thought the other would catch me, and the result was my fall, straight back, right onto hard concrete. I am 6 feet tall and was, at the time, about 145 pounds, if that is relevant to the speed of the fall.
My body was stiff as a board all the way down. The back of my cranium took the blow which, I was told, sounded like a bowling ball hitting the cement. I suffered retrograde and antegrade amnesia, a few minutes of actually forgetting my own name, a VERY distorted sense of the passage of time, and I was very confused.
These symptoms passed after a few minutes and never returned. I resisted offers to take me to the hospital at that time. (I should have gone.)
These days my run-of-the-mill memory problems sometimes make me suspect the fall was the cause, BUT I have had memory problems before that.
I am an intelligent man in his mid-30s working on his 3rd degree, so clearly there are no intellectual deficits to report (that I can think of).
(1) I am highly concerned about the so-called coup contrecoup motion of the brain. Although it has been well over a decade, some say a coup contrecoup injury can kill you years later. I doubt this because I feel fine. How concerned would you be if this was you?
(2) Should I get a CAT scan? What should they be looking for?
(3) If at the time of the concussion there was a small amount of bleeding inside my head, but not enough to cause problems, what becomes of that blood? Does the body simply absorb it over time?

I appreciate your time. If you could also refer my question to others so that I could benefit from more than 1 opinion, I'd be very grateful. Thanks.