Sounds like a typical Saturday night during my drinking years.
Kidding aside though, I might have gotten a concussion during my first TKD tournament after a kick to the face left me seeing stars for a few days. Did not get KOed or go out, but enough to where I likely suffered some damage.
From what I understand about concussions, and I am no expert or close to it, once you have the first one, you are at higher risk for more of them later on, and one plus one does not equal two, it is more like three or four, the damage sort of compounds the more of them you have. People do not usually see the results of that damage until later in life, meaning that the behaviors you listed do not show up as much when you are young, it shows up big time when you are older.
Good on you for donating your body to science, it could help a lot of people who come after you.