Lol Buruna 600 sounds more like a type of killer fish instead of a pain killer.
well, it is strongest (if I correctly remember) painkiller you can buy without prescription in Finland. Well, it is good stuff it has taken effect, my head doesn't hurt anymore, but leg still hurts a litle 
Lol stop whining xD I suffered terrible pains in my knee for 7 years ! I had something called the Osgood-Schlatter disease. My doctor said it would disappear in a few months (which it usually does according to wiki) but mine didn't and it I still can't jog, be bent through my knees for longer than a minute nor can I sit in seiza or that position where you fold your legs over each other. When I still had it and got a blow on my knee the pain would be especially excruciating like your tendons are being ripped apart, that would cripple me for a good 15 minutes.
But now I'm 80% healed :3
well, normaly I don't whine about my leg having pains

I've had them all-the-time after I about 8 years ago fell with my cycle

(flew to the ground my right knee in front, about 2m of my bike

) this time had just bit bigger pains

couldn't walk normaly
Now when remebering things, I've flewd off my bike with half-sommerassault and landed on my neck and left shoulder

still have a scar from that (on my left shoulder). I've felled with bike about 20 times in my life

those are just the worst and most painfull of them

Well I've also walked to home with my left side of body bleeding because of falling with bike, but that didn't hurt so much...