Concussion, anyone?
I was T-boned the 20th of December. I recall everything up to the point at which I pulled out into the intersection. For the life of me, i don't know why I did that- I'm a very cautious driver and usually won't pull out from that intersection if a car is in sight. . So- anyways - I ended up with a concussion and some muscle damage.
The muscle damage is mostly healed, but I am aware more and more of odd results from the concussion.
On two separate visits, the doctor asked me to subtract 7 from 100 and keep going. Easy, right? Except that I got it wrong. I can do it on my own, but not under the pressure of someone asking me to do it.
In conversation and writing, I have trouble recalling certain words and even the names of objects. It's not really obvious to most, just to my family.
If I tilt my head to look up at a cupboard, stand up quickly or roll over in bed, I get the same sensation you got when you spun around as a little kid. Not bad, but enough to keep me off step ladders and to be sure to have a hand on the stair rail.
I've been getting headaches; again, not too bad but then I used to get migraines so my tolerance may be higher than normal.
I wake up every two hours all night, but that is getting better.
The oddest thing I've seen is what happens to my typing. When typing a short, common word like "the", I may substitute another word like "and", or "up" for "of".
So - take care of your brain, it's the only one you got!
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If I recall, if you get hit on the right side of the head the concussion occurs on the left side, is that right? Is there something you can do to recover more quickly or is it just a time thing? Years ago a co-worker of mine was in a biking accident & suffered a concussion. Fortunately she had a helmet on, but it still took her a very long time to fully recover.
Take care of yourself, hedgehog! 
and do some of the tests there, or better, sign up and do it regularly. Chart your progress. See if it helps.
http://www.positscience.com/
so he knows me pretty well. I'm going back in a few weeks for further check but right now he prescribes time as the best treatment.
I, too, am dealing with it as we speak. 
http://bianj.org/Websites/bianj/images/recoveringfrommildtbi.pdf
I am on my 3rd concussion and this one really did the trick. A month out and I am still dealing with spelling issues, verbal gaffs, memory issues, impulse control issues, ripping headaches, vertigo, fatigue, and insomnia.
I had no symptoms until almost a week after my fall (ice skating before Xmas) -- I went to see "The Hobbit" in 3-D and was hit with a migraine that had me in bed for 2 days! Then the vertigo hit, and then finally the rest of the symptoms.
I was incredibly stupid/unlucky to have to keep working (very physical work, with lots of lifting and walking) instead of taking the time off I needed to heal -- that made the post concussion syndrome more likely to happen and the healing process to take longer. 
Hang tough!
symptoms can surface anywhere from a few days to a few weeks later. I have no doubt there are soldiers who have either not been aware they had a concussion or been cleared by medical person and then sent on their way. And there is a HUGE problem with anyone who has suffered a concussion and then had another head injury within weeks of the original -- brain damage on the second hit is much worse.
My worst symptoms are from the damage to my neck when it snapped back onto the ice -- I actually have some whiplash from it that is causing the really bad headaches.
Recovery can take from 3-6 months for PCS.
