I had a buy of a tumble whilst running yesterday. I did get my hands down to take a lot of the impact, but also managed to land flat on my face. Have a very bruised and grazed nose and sore shoulders from the impact, but seem to have got away without any real injury.
However, I have a dreadful headache this morning which I assume is related.
Just take some paracetamol and wait for it to pass? I haven't had anything else I'd link to concussion symptoms.