Thanks everyone, that is really helpful! I think the advice about taking it easy is very important. I am lucky in that my grappling coach is a doctor too, so he will hopefully be able to keep me right!

The links re chiro are really interesting. I have read a lot about people with PCS who went down that route and some folks say it changed their lives. It is something I will look in to more.

I understand your concern for your son. At the end of the day (and this is what I am thinking about too) there are lots of ways to keep active without doing full contact sports. I have some important decisions to make. Thanks for the input folks, it is helping me make those decisions!