Having another concussion after you know that you've had one, can be very anxiety-producing. I have fallen (post concussion) and my anxiety brought on symptoms that looked like concussion symptoms. I had to be "talked down" by a trusted friend, before I could function normally again.

Get good rest when you can, eat right, and if you can have a regular schedule to normalize your new life, so much the better. Your brain just needs to recovery and possibly relearn a few things. Give it time. It can get better.