Originally Posted by Klaus

I have done various similar things during my recovery. Early on I felt completely recovered, then got drunk and the effect was similar to another concussion. I have also been jolted forward suddenly from behind, with a really bad effect.

It sounds like either the jolting around of your head from sprinting, or the increased blood flow, may have been too much for you at this point. In my experience these sorts of things definitely slow your recovery but do not stop it or mean that you never recover. I am recovering well now but I think it took a lot longer than it otherwise would have. You just have to suck it up, learn the lesson and make sure it doesn't happen again. Good luck!