So we had our degu in a ball when the ferrets were running around, and a couple hours later our degu somehow got out of his ball and the ferret cornered him and bit him on top of the head, behind the ear, its been almost 3 days now, he does want to run but is stuck turning to the right, he has been eating somedays, and somedays he has not. What am I able to do to help him heal correctly.