Rest. Ibuprofin.
You know if you have a concussion when you are really disoriented.
I had one in Oaks a couple of years ago. After the knock on the head, I got lost on the trail. Everything looked unfamiliar (at the time, I thought it was normal that nothing looked familiar -- strange sensation in hindsight.) I had my GPS so I followed it to my car and drove home. That too in hindsight is scary.
I brushed off the knock on the head as nothing, took some aspirin and went on a date with my wife that I had promised. We went to CPK and she later told me I was acting really loopy. As we got in the car to drive home from a place we had been a million times, I casually, but seriously asked, "Where are we?"
That was when she got really worried and insisted the next morning I got to the hospital and get a scan. Everything negative, but a concussion just the same. From what I read, these are the symptoms of a concussion.
For what its worth.