This article harks back to his nightmare in 2002...when Bayer Leverkusen ended up losing in the final of the CL, final of the German Cup, and lost the league on the last day. In addition, Ballack lost the World Cup final with Germany (though he didn't actually play).
IMO such defeats are always much harder than having a totally trophyless season with no chance of winning anything, because you have that feeling of being so close and playing so well throughout the season, yet ending up in 2nd right at the last stage.
That sequence of results must have been ridiculously tough for him to recover from mentally...personally it'll be nice to see him get some redemption on Wednesday. Doubt it'll happen though.