I wrote before about getting in there and doing it, but I also want to caution anyone.
I hit my head at least six times after my initial concussion. The first one was falling off a horse, then two weeks later I was sitting twenty feet away from a volleyball court and a soccer player kicked the ball as hard as he could and it slammed into my head, then my brother was trying to catch a ball in the pool and his head came right down on mine, then while dancing I was dipped and another girl who happened to be dipped near me kicked me in the head (this happened twice two months apart, then I went sledding because I was having only slight headaches and the jostling of the sled cause me to have four months of intense nausea and dizziness, the dizziness caused me to fall on some snow jostling my head again and then it caused me to stumble and hit my head on a metal heater.

Right now, the nausea has mostly gone unless I get too warm, the dizziness is gone unless I get too cold or my pulse gets too high, my headaches are as bad as ever and are causing me to be grumpy and have a lot of trouble remembering little things.
I have seen at least six doctors, had 2 CT's and one MRI, and the only thing I have been told is that I'm either imagining it all or that I will just have to learn to deal with it because it might not ever go away.

So, the moral of the story is one concussion makes you more vulnerable to a second...Be careful! Good luck all!