I've googled far too much I'm afraid.
DH had a bike crash yesterday morning (at speed, with helmet, no other vehicle involved). He walked away, felt fine. Couldn't really remember what happened,and by the afternoon had a cracking headache with some dizziness and nausea. Took him to the docs, who tested his reactions etc. and said everything was working as it should do. Said headaches etc might continue up to six weeks.
He's had a day resting at home, gone out now for a bit. Looked pale tonight, but said he was pretty much OK, just beaten up.
Minor, right?