He looks completely shot of all confidence...but lets look at the team and setup he is in.
He is often isolated up front...he'd need a set of binoculars to see another Albion player at times. He knows that often when the ball is lamped up to him, he will have no Albion players around him to support. In terms of chances, he gets one or two a game - most strikers will get at least double that per game...she he knows when one chance comes, it might be his only chance - could explain why he's a bit snatchy. Basically the service he gets is dreadful, almost non-existent!
The way he trudged off at half time against Swansea suggests he is completely fed up - his confidence will bound to have been affected by all of this.
His performances of late haven't been good enough, and we need to see an improvement, however it is difficult for any striker in a Pulis team, as we simply don't set up to effectively utilise a centre forward!