Cerebral guy,

I doubt you have a risk if Second Impact Syndrome. You just had a rough day. There is no way to say if you will have cognitive problems. Probably not. But, you really need to deal with your obsessive thoughts. They will do much more to limit your academic skills and your recovery.

You likely did suffer a concussion but nothing will change that. Quiet rest is the only way to recover from a concussion. As I said, anxiety and obsessive thoughts will limit your recovery. Let it go and get some good rest.

My best to you.