Okay, here's the thing with that. I have experienced the exact same thing a few times now when I got hurt.
The sore jaw, isn't too bad. I didn't hit my face that hard, my cheek and jaw have very small scuffs, almost not even noticeable. The arm is definitely the most hurt right now. There was no loss of consciousness, just that sick light headed feeling you get with a painful injury right when it happened, so I really don't think I have a concussion. Headache is gone and was pretty mild at that. No nausea.
I remember one time I hit my knee on a cement pole and the same thing happened, almost blacked out from the pain. Happened another time when I took a nasty shot to the jimmies once too... I was practicing casting a round fishing net with lead weights attached all the way around the edge and swung it wrong. Those weights whipped around and nailed my boys dead on. I got light headed and had to lay down, almost blacked out. That one really sucked, lol. Also happened when I broke my foot pretty badly too. That sick, light headedness and almost blacked out then too.
Yesterday was exactly the same. I was fully cognitive and never actually hit my head or lost consciousness. Just that sick, light headed feeling I'd experienced before with painful injuries.
God, I'm a wuss... lol.