Concussion, who's suffered from it in the past and how long to heal?

My head took quite a knock in my recent prang, and the concussion I suffered seems to be taking rather long to clear, who's had it in the past, what were your symptoms and how long did it take to clear? Obviously the degree you had it will make a difference, possibly your age too, I had quite a hard knock, memory too.....
I still feel a bit shaky on the feet, get tired quickly, and have short term memory issues. Luckily I'm still young, 51..... :biggrin: