Take it to an authorized repair center.
Needs to be repaired.
BB = Ball Bearing. It a form of Shot, used by shotguns.
Head shot.
It is not likely, but it IS possible. Depends on the bb gun, distance, and where you are hit.
BB gun
Not normally
no
I suggest the you contact an air gun repair shop to have it fixed. Try looking up "Air gun repair" on the web and have them repair it for you.
The compressed air gun, which shot metal bb's was invented before the paint marking gun.
Yes it could cause problems.
A shot gun wedding.