my rabbit is pulling her own fur out. sometimes when I hold her up, she makes this yawn/roar face. she did that after pulling a ****load of fur out. and I got it on camera http://www.putfile.com/media.php?n=MOV00618
Nothing is wrong with your rabbit. If its a girl, she's either pregnant (do you have a boy bunny running around?) or she thinks shes pregnant (instinct of false pregnancy.).
Its totally normal. What happens when rabbits have babies is they make a nest for them with the fur they pull out. The babies have no fur when they are born, so the mother will do this to keep them warm. The fur will regrow when your rabbit has the babies, or when she realizes shes not pregnant.