You must have made a save after entering the Big Top (or even later). I know no way back from this moment to the figment-rich part of the level. The only thing I think you should do (if you so desperately need those figments) is to play the Meat Circus level from the very beginning (you`ll have to load from the autosave or an earlier save).
Yuri Furtat aka Saodhar
MENTALIS UBER ALLES!!!