Replying to Injury setbacks.

i have been having problems with my left shoulder for a while, disslocated it and twisted it wrong a few times, but still managed to ride. 

reccently i dislocated it again on a box in the park, feels loose and weak compared tothe other one and always pinches on a nerve.  Hurts to use it so now my confidence is right down and i wont touch stuff ive been doing for a while.  this was on a board.  but my shoulder isnt right yet and im still riding, and even thinking about going back to the skis. 

Was wondering if anyone else has had injurys that have put them off.  and any suggestion as to dealing with the effects.