Really J.B. TMZ.com has the footage of Justin Bieber feeling better in fact, he's feeling good enough to FIGHT. Bcause he went after a photog in London and screamed,

"I'LL ____ING BEAT THE ____ OUT OF YOU."

See the video (Warning it's explicit)

http://www.tmz.com/2013/03/08/justin-bieber-fight-photog-bouncers-london-video/