My son was skateboarding and hit his head on a block wall while going down the handrail, which knocked him unconscientious before he landed on the ground hitting his heat again. The back was split open and has been sutured with inside stitches and outside staples. The did MRI and CT scan and said all clear but his jaw hurts to eat and he blows his nose and a lot of blood comes out (also when he sneezes) plus spits blood. Is this normal? He's 21 yrs.